If it's at all possible I try to spend some time in nature - even if it's just the nearest park. Breathe some air, watch some birds. I find that really helps me to ground myself. If it's been a difficult session T will generally suggest now that I find myself somewhere green to go afterwards.
If I can't do that, I cuddle my cat as much as possible. That helps too.
Sorry you're finding yourself so heavily affected by your sessions, Lost. You are doing good work.