Glucose gets in everywhere. That means it can also get into your eyeballs. That's why when people suddenly drop their blood sugars, they have blurry vision for a while: their brain's been compensating for the glucose in there, and it has to learn not to do that anymore. So fluctuating blood sugars can affect your vision.
When I have a hyper from unexpected sugars, like when I was served my husband's sugary drink and didn't realise it contained sugar until I'd already had half of it... Flushes, palpitations, wobbly knees, confusion, headache etc. That basically happens to me when my bloods go up hard and fast. Others might have other symptoms. But it happens. You might want to start testing regularly to see what your blood sugars are up to. Do it before a meal and 2 hours after, or, should you feel horrid, check when you do so you know what your blood sugars are doing. A pattern might emerge. (You're aiming of a rise of no more than 2.0 mmol/l between the before and after the first bite numbers).
https://www.diabetes.co.uk/forum/blog-entry/the-nutritional-thingy.2330/ might help some.
I wasn't exactly alive, so to speak, by the time I was diagnosed five years ago. I just existed. I was so extremely tired all the time, depression was strangling me, and my panic attacks were crippling. You know how it is, from the sound of it. I didn't have the muscular strength to lift a fork, and I didn't care enough to, either. While I have always been a clinically depressed introverted borderliner, how bad it affects my life was very, VERY dependent on what my blood sugars were doing. When I got them under control, my panic attacks were still there, but I could often fight through them. A few years ago I started going outside by myself for my doc's appointments, because my husband couldn't take the time off any more and I felt like it was something i should at least try to do to unburden him some. About a year after that I finally caved and started going to a physical therapist for the shoulder pain that'd been with me for years already. That was once or twice a week, by myself, a 3 km round trip on foot. (I can't ride a bike due to chronic hip bursitis, and I can't drive a car because being as panicky as I am, I can slam brakes in fast traffic, so... Never got a license. So walking it is.). I'm doing things I never thought I'd be capable of, which other people take for granted: walking to my doc or the vet, the chemist's etc... Mainly things that really need doing, but I also went out for a well over 2 hour walk when there was snow. Took me a few days to gather courage, but when it looked like it was a now-or-never thing, I went. It took me days to recover, but I did do it, which was unfathomable before I got my blood sugars sorted. And for the record, as a teen my mom was convinced I was anorexic. I kept throwing out my school lunches. But I was so very stressed in school (one big social situation, day in, day out), my stomach hurt a lot, and it got that much worse when I ate. So I stopped eating lunches, to ease the pain. Hunger was easier than that gnawing/burning sensation. But I do see how you can be put off food entirely. Just... Start small. And if you can't do it for yourself at this moment, do it because at some point it could well make you feel better than you are right now. Anything is better than this, right? It can get better. One low carb meal at a time. It'll take a few weeks/months maybe, but you'll notice the difference.
It'd do no harm to get yourself checked out for low blood pressure etc, but I'm guessing if you have blood pressure done at the doc's you'll have something similar to white coat syndrome: just being there'd put your numbers up from the stress of it. Might be useful to buy a cheap home monitor, where you can test when you're relaxed.Frankly, I am not convinced that diabetes in itself can be the sole culprit, with the exception of hypoglycemia.
Try and be good to yourself. It'll improve your quality of life. It's not as dark as things seem right now.
Jo