Hi there.
Welcome to this community. Sorry to hear you are having such issues and that no one has replied to you yet. What you've been going through sounds really rotten.
I take it from what you've written that you've had a brain MRI and a T2 scar was found, but have you had a spinal MRI or LP? Were you given any kind of plan when you were discharged from hospital? Was MS raised as a possibility?
In terms of what occurs when you get hot, a suggestion you may like to try is getting a cooling scarf or some other kind of cooling device so that you can avoid this situation as much as possible. The likes of Fishpond in Australia sell these pretty cheaply.
Take care.
Poppy
I am sorry for your problems. Here in the States you would see a MS Specialist. I am not sure how it works there.
Alex