Hey there! Its good to vent! Sometimes I find it hard to share in certain situations, but that was very brave of you
Look at it this way, the medication does make you a bit uneasy yes, but you needed that group for the time and place that it was there. It was there when you needed it and you used it. Try to look at it from that angle. People, places and things come into your life at moments in time when you need them. That's the wonder about life and humanity.
If you want to go back to the group, go back, if not don't. You said your piece and if they didn't like it "oh well to them". I am glad you shared, never feel bad about that.
Stay strong!