How do I handle all of this?

K Asked: How do I handle all of this?

I just need some advice please. I'm a junior in high school, I have three APs coming up, no material to study, no time to study, and I feel like I'm going to fail everything. My teachers won't stop shoving more work and tests and essays in my face and I can't handle it all. I can't afford to do badly on any of it. I also struggle with a lot of negative self-talk and I've had a lot of suicidal thoughts lately. There's also this girl, my best friend, and I'm in love with her. I was having a hard time knowing I can never be with her but for now it's not as bad. What's wrong is that my own moods are based around hers, and when she's not in school or I don't see her every day/every other day I get very anxious. I know that's not healthy. I'm just miserable and stressed and I can't handle it all. I don't want to be a failure. I can't be. But I'm doing so bad in everything. I do see a therapist but it's not enough to help me. Plus, I have nothing to look forward to. There's no light at the end of this very dark tunnel, which just makes me even more depressed. I can't afford to have suicidal thoughts right now but once my mind can be idle again I'm sure they'll return full force. Can anyone help?