Trust me - your heart is not broken. You don't love this guy. You never have.
You projected all your insecurities onto this guy (fear of abandonment, fear of being forgotten, doubts of self-worth, low self-esteem, etc). And so, it's your ego and your old emotional pains that are vibrating right now. But your heart - nah, you're fine.
You need to get into therapy. ASAP. When you start school, go to the student health center. Find ways to get low-cost therapy, if you don't have medical insurance. I would also suggest you stop stripping - I think this profession preys on your weaknesses. Take out a student loan instead.
In the meantime, realize that you are being obsessive because of your ego, not because of your heart. It's not him that you want. You just want validation, from any man.
What has helped me:
EFT. It's like accupressure +therapy. I went to a master practitioner, because I knew I had very complex, far-reaching issues. But many people do it themselves with good results.
Here is a website with
free videos, showing you how to do EFT for different issues. If I were you, I would look at the self-acceptance, anger, forgiveness and memory release.