I can't answer very comprehensively,
@lunarainbows, but I'll have a go.
- did your GP prescribe compression garments or do they get confused and say they can’t do it? They said some GPs say that so then I might have to buy my own. I’d rather get it on the NHS if I can! Edit: they seem really expensive to buy!
Under the guidelines, my GP can only prescribe if there's evidence of venous incompetence, but each clinical commissioning group may be different. I started out by finding someone on eBay who I think was claiming them on a free prescription and then auctioning them. That gave me two batches of three pairs for less than £30, which was a great start, especially as they last ages. I gradually added a few more at the commercial price of about £13 a pair for the stockings I wear.
does wearing the garments, irritate your skin and cause rashes or problems? Because it doesn’t let air through for the skin to breathe properly? And how long do you wear them for, before taking them off?
Only silicone hold-ups aggravate my skin, which won't apply to waist-high tights anyway. I have quite irritable, eczema-prone skin, but no problems with the stocking themselves. I just wear them until they make my legs ache, then take them off. I often get through most of the day, but not all evening as well.
-how often do you wear them, is it meant to be every day?
Bearing in mind that I'm much less severely-affected than you, and don't have POTs...I only wear them when I'm having a bad patch with OI and dizziness. I'll often go weeks and even months without them if I'm having a decent run.
- also I see above some people struggling with the sensory input. Is there anything I can do to mitigate that!? (I’ve been told to wear grade 2 stockings, not sure what that means).
I'm autistic and don't have sensory problems with stockings, but this is probably a very individual thing—I would have a problem with something that was tight on my midriff. As I haven't been prescribed my stockings by a specialist I only wear Class 1, which is less tight.
I wear compression shorts that are really designed to hold stoma bags in place, so they're not nearly as tight; these are fine, and do help a bit with OI. They're probably no use for more severe symptoms, and to be honest 40% of my reason for wearing them is that I'm absurdly long in the body, and get freezing gaps between my trousers and tops when I'm sitting down! They come up almost to where my bra would be if I wore one, so no more chilled kidneys. (The other 60% of the reason is that I have a painful fat disorder, and light compression reduces the pain nicely.)
Finally, you may find all-in-one tights difficult to get on and off, specially for loo visits. If it were me, and if the right garments were available, I'd much prefer a stockings-and-cycle-shorts combo. I suppose they might make tights with an open gusset, though, so you can wear knickers on top of them instead of underneath? That would make life a lot easier.