You said it all:
I also have a lot more to lose now.
Relationship, job, education, friends, the lot. If you are throwing up every morning that's especially bad.
I don't mean to be horrible, but you need to decide whether you are going to have your life or whether these problems are going to destroy it. Being bi doesn't look to be the real problem here. The grave danger is that your coping mechanisms are ruling you and hijacking everything else. I know because I have been there - it's not worth it bro.
Both you and your lady need to be in therapy and keep to it. Therapy doesn't mean you are a loser or weak, any more than going into hospital means you are weak. All it means is that you need help, and believe me, accepting that fact and acting on it isn't weakness - it takes a lot of courage.
I hope you will both take the situation seriously - it really is important.