I'm going to college in about a month and a half. I've posted a bit about my trouble with my feelings and actions in the past, but I've been feeling mostly neutral. However, I still deal with the problem of suddenly feeling extremely low. For about 2 years I experienced pretty much constant low mood, and now, this calendar year, I normally experience my low moods for a few hours to days. I might experience 2 or 3 weeks of low mood, but that's almost always around my period (I feel most emotional before, during, and after my period, it's always been that way).

Today was an odd day. It started out fine. I felt motivated and had plans on what to accomplish. I went to the gym and had a good workout. Lots of friends texted me, which doesn't always happen. Suddenly, mid-day, I'm hit with extreme sadness. I'm either on the verge of crying or in tears for hours, and my mind is flooded with thoughts of self harm and suicide. Everything anyone says to me is upsetting. I've been feeling a bit more sad than normal lately, but today is especially bad. My parents say "Well we hope you don't act like this when you're in college" and that scares me because I can't control it. I haven't been to therapy in months. I don't have anyone to talk to about how I feel right now. Even if I were seeing a T, she couldn't talk to me just at moments like this specifically when I want someone to talk to about my feelings.

I'm wondering if restarting therapy with one month before college left would be a useful idea. Could I gain anything from that?

Is it even worth it to go to a therapist if you only feel sad sometimes? I feel like I will waste a T's time.