Discharged from the army and now I have no direction in life

I (24m) was medically discharged from the army due to severe mental illness. I enjoyed my time there even though it likely wasn’t good for me mentally and now I don’t know what to do. I’m a university student but even though I go back in a month I have not picked out classes nor have I arranged housing and don’t know if I’ll be able to secure housing. I’ve been stuck in a depressive loop where I don’t want to go anywhere or talk to anyone, I play video games for most of the day everyday and get high. I just feel directionless, like one of the few places I had meaning and community is gone now.

I’m pretty much done my undergrad now and was thinking about law school but I’m also not sure, I’m interested more in politics and history than law and I’ve heard it’s extremely stressful which after what happened I don’t know if I’ll be able to handle it. My therapist I’m seeing says it’s alright to not know what I want to do but I feel directionless and would like some advice.