The problems with balance go back to my childhood. I've always had slightly dodgy ears, and yes, it is vestibular - or at least it's always been diagnosed as such, but now there's a lot of talk about poor neck posture being a causative factor. And as you get older you tend to start experiencing positional vertigo due to floating crystals in the lymph in your inner ear. I certainly do get some of that - roll over in bed, the world spins for a few minutes. This is different, it's more insidious.
Actually, I suspect I might be suffering from vestibular migraine. Sounds peculiar, I know, but for some people their primary migraine symptom is balance problems rather than head pain or aura. My mum was a migraineur although it used to disappear for years at a time. Never went any further down that route because as I mentioned, I've gone 5+ years with no significant balance symptoms so I was hoping things were in remission there.
I think it's worth a GP visit to discuss. Trouble is, I now have so many separate conditions and my GP will only make 10 minute appointments and will only discuss one condition per visit. I'd be back and forth to the surgery all week! What I really need is a doctor who will look at everything in the round. Perhaps private is the only way there. Luckily if it's needed I can afford it (or at least the insurance premiums to get it).
But the headaches and dizziness started on exactly the same day I started Metformin, so frankly I see a correlation there. It might not be a direct side-effect of the medication, but of how my body is responding to it.
I shall up my salt intake to a reasonable level, and I need to start drinking more water too.
On the plus side, I had a good stir-fry last night. Chicken, peppers, broccoli, mangetout, spring onions. Supermarket didn't have any beansprouts, unfortunately. I have to say, if you told me I could only ever eat that meal for dinner for the rest of my life, I wouldn't have a major problem with it