It's looking very likely that I have POTS. My HR doesn't go up the full 30bpm every time I stand up, but then I can't stand dead still anyway. I've not had a TTT yet. I'm too tired to go into it now, but suffice it to say that I've been looking into this for a while, and I have good reason to suspect POTS, mast cell problems and/or EDS.

I stopped eating meat eight years before I got ME, i.e. twenty-four years ago, and never experienced any problems due to it. Going vegan actually improved my health, as I don't get on with dairy. I'll bear the carnitine etc. in mind, although I've taken acetyl L-carnitine in the past without any noticeable effects. There's zinc in my multi-mineral supplement. Which I ran out of a few weeks ago, now you mention it, so that might be one reason why I'm feeling cruddy at the moment.