It is a very good sign that you are laughing and feeling good during those moments. An excellent sign. That said, you are overloaded. You have way, way too much going on right now. The 19 credits in biology alone are a full-time job. If I were your therapist, and I'm not, I would probably not ask but rather tell you to cut some things out--for now. You are trying to do too much and it is affecting your quality of life. Your brain is trying to tell you this. So, my advice, for what little it is worth, is to find some things that you can cut from the schedule to free up more time for you to concentrate on the most important things. Like your mental health.