I have enjoyed speaking with you. Made my 300th night in a row watching Netflix much more tolerable having a bit of company.
I doubt he'd be on Mumsnet but just in case... Mr Ex-AnybodyElse, if you are reading this please go away, we don't like you!
If you enjoy wine making then it's still worth doing even if you can't drink it. I assume it's quite low-cost? A bottle of homemade wine would make a lovely, thoughtful birthday or Christmas gift. Also a great way to increase your social circle, taking a bottle of lovely homemade wine round to your neighbours, whenever that becomes possible, would be much appreciated I'm sure and get you on chatting terms.
Have you had your thyroid looked at? I've read that it is very manageable with the correct treatment.
It's so tempting to try to understand the real reason he's done this, especially since the switch was so sudden, but he's not the person you knew so there is just no way you could figure out exactly what happened, and anyway it makes no difference to you now. Don't torture yourself about it, people are strange.
I bet whatever 'certain sexual acts' you're referring to are disliked by plenty of women. We all have our preferences and things we aren't comfortable with, that is normal and the only acceptable response to you letting him know would be "no problem, thank you for telling me".