I think I share many of your symptoms... You are not alone!
Mine started almost 2 months ago, at the beginning of February. At first I would get them on and off, some bad days and some good days - lately it's been every single day.
I feel a sort of dizziness, like I'm drugged or something and I feel my eyes are heavy and don't focus well. I have to squint to feel like I'm actually focusing and my eyes often stare blankly when I relax. I'm also tired and sleepy, especially after 8pm (I used to have trouble falling & staying asleep just a month before these symptoms and went to bed at 3am, now it's hard to keep awake at 9pm!). I also have trouble waking up in the morning, feel sleepy and dizzy. Sometimes when I wake up during the night ((I do that at least 1-2 times) I feel dizzy as well.
I don't know it's so bizarre, like I'm trapped behind a glass wall or something. I have brain fog. My eyes are heavy and my eyebrows hurt from squinting. I feel tension in my neck and in my throat. I feel pressure behind my nose and sometimes in my ears. It's horrible, I FEEL like I can't focus well, but when I need to drive, work, think I can do it OK. However I'm sleepy and drowsy, yawn a lot... feel tired but physically I'm apt, I can climb stairs, to sit-ups etc.
This whole circus started after 2-3 months of INTENSE, debilitating everyday health anxiety and worry. I hope it's because of anxiety that I'm feeling like that and it's not some cancer or brain tumour or what not.
During the last 4 months I've had abdominal ultrasound, cervical MRI (that also captured much of my brain), bloodwork (CBC, iron, glucose etc.), urine tests... they were all perfect. My thyroid was a bit on the hypo side, but within normal range so my endocrinologist reassured me that the thyroid cannot cause my symptoms. She was very sure of that. My TSH was 4.1 and maximum was 4.2, my T4 was normal and my T3 was 1.26 and 1.3 was minimum. She told me I'm absolutely fine and these minor variations mean nothing, that 1.26 is basically the same as 1.3... and that my T4 & TSH were good so no way I have anything wrong with my thyroid.
So yeah, I'm confused. But I think it must be anxiety, even if my thyroid is a bit low (although my doc STRONGLY disagrees) - it could actually be a consequence of my constant STRESS and cortisol that I've been pumping for months.
I hope you'll stick around & let me know if things get any better. I will do the same... it actually helps to know many people with anxiety have these symptoms and they don't have any terminal illness.