WC,
I think your ophthalmologist is right about the blue filters in the prescription glasses, and the fact that the elevated eye pressure may be a factor. I could mention other causes of headaches, dizziness, nausea, but the most important thing to do is to get a thorough medical checkup from an internist. Also, see a neurologist (headache specialist) and get an MRI of the brain, just to rule out serious things.
In the 1940ish movie, DARK VICTORY, Bette Davis plays a commanding socialite who develops headaches. One of her admirers who falls in love with her, is a neurosurgeon. He observes her seemingly casually, but notes that she misses lighting her cigarette. With this evidence of spatial disorientation, he diagnoses her with a brain tumor on the spot, operates on her the next day, and is proven correct. A few years ago, one of my patients told me he was bumping into things on his right side. I found that he indeed had right visual field defects, and I diagnosed him with a brain tumor on his left side, confirmed with the MRI. He survived with conventional treatment for 6 years, but he refused my advice to go on a keto (very low carb) diet, which research has shown to extend survival in brain cancer patients.
Doctors used to be trained to make diagnoses of nearly everything by taking a history and doing a physical exam, before any tests are done. That was when CT scans and MRI exams were unavailable. Nowadays, this art of diagnosis has been largely lost, and more reliance has been placed on doing tests. Still, my neurologist colleague and I order MRI tests of the brain on nearly all headache patients, because the traditional art of diagnosis doesn't pick up everything. Please insist on getting an MRI, and don't let the MD shrug you off by prescribing pain drugs for your headaches.
You probably don't have any serious condition like this, so I'll get into some interesting causes of headaches I have seen in patients. LED lights are an example of electro-sensitivity which is a problem for a % of the population. It can cause insomnia (my case) or other brain symptoms. I bought products and fabrics to make shielding for 4G and maybe 5G, from lessEMF.com. Your wife could help you with the sewing. I have some products from Airestech which partially neutralize the effects of environmental EMF on the body. I carry the Defender Pro in my shirt pocket all day, and in my underwear when sleeping. I bought the esi24 meter from lessEMF, which measures RF, magnetic and electrical fields. I have had modest improvements with these strategies, but the 45 year old wife of the super in my building had more dramatic results. She had severe insomnia. I measured all the rooms in her apartment. The RF levels at the head of her bed were off the roof, but they were lower at the foot of the bed in the middle of the room. The 1st step was putting her head where her feet were. This alone gave an improvement. Then when she went into the other room where RF levels were much lower, she then began to sleep like a baby. I'm not kidding.
I use orange goggles that fit over my glasses in the evening to filter out 98% of the blue light which suppresses melatonin, the sleep hormone. Get the Uvex S 0360 X Ultraspec 2000 model from Amazon. This model still transmits 50% of the total light, so you can do your activities. Melatonin declines with aging, but young people who use bright screens from phones and computers at night can have melatonin suppression. Melatonin suppression also occurs with stress, so it is important to manage that, so I hate to say it, but try to avoid doing audio research at night. If you must do it, use the orange goggles, which you can also use for listening with also the lights turned down. All this will help restore your melatonin levels. Even if you sleep like a baby for 8 hours, the odds are that your sleep quality is not as good as you think. Many people like me are actually handicapped in sleep quality and quantity, but rationalize that they are OK by getting involved in pleasurable activities like audio or anything else, to take their mind away from the true realities. Melatonin deficiency can increase the risk of many conditions, so your blue filter glasses and my orange goggles are a good strategy.
If the neurologist diagnoses migraines as a cause of headaches, they generally prescribe specific migraine drugs and avoidance of trigger factors like stress and foods. I go further, and start by recommending a gluten and dairy free diet. These are the most common foods that cause food sensitivity. If you have abdominal symptoms after eating moderate sized meals, that often indicates food sensitivities, which cause what is commonly known as IBS, irritable bowel syndrome. The IBS leads to "leaky gut" which opens up the Pandora's box of overall body inflammation, such as migraine headaches as an example. (There we go again, Mephisto and Pandora, lol.) Even if you don't have any abdominal symptoms, it is worth a month trial of avoidance of gluten and dairy, which has helped many of my patients with neurological symptoms of headache, dizziness, etc.
I hope you and some other people find this info helpful.