Hi Alstro and welcome!
Like Toob I too have started... well same really, dragging myself to gym 3 times a week lately.
I have to say I feel fantastic afterwards much more energy and I guess the sort of high that comes with exercise. Definitely not during though at this stage!
I don't have offs anymore (had DBS) but other members might have an answer as to whether they go off more easily post exercise.
I can't remember doing much before apart from swimming when symptoms were still mild so I can't really answer that one.
Cheers,
Lee