Yeah, I didn’t find getting into groups easy. I found I had to go in via the groups page and NOT the timetable. Maybe someone more experienced or a mod could help.
Sorry to hear your head is a mess, but well done for not gambling. It does get easier in time but that’s probably no comfort right now. Is there something you could treat yourself to? I know you will be reluctant to spend money right now and especially on yourself, but something inexpensive which will keep you further away from a bet? You are worth it.