does your t have any way to contact her after hours or between sessions? I know it's hard to keep reaching out, but do what you need to. Are your parents (or whomever you live with) available to reach out to? (I'm guessing you are still a minor)... if things get really bad, can you call 911 or ask them to? Or call that hotline, but please keep reaching out. You deserve to be safe, even from yourself.
Also, have you told your t how bad you are actually feeling? Sometimes we can understate things when we are feeling really badly.