Honestly if you know that this was triggered by the environment, seeking a therapist would help more then a med change. Meds don't teach you how to deal with emotions. Meds alleviate the feelings. Learning how to cope with those feelings will make you feel better about yourself and give you confidence.

I am sensitive to rejection myself, and have learned to come to terms with negative thoughts. I precieve rejection when I haven't been rejected. I have learned coping mechanisms to counteract those feelings of rejection. The feeling isn't invalidated because its how I feel. What I feel is what's real. How I respond to the feeling is the real test.

Also antidepressants generally take 4-6 weeks to fully work. If you were to feel better after a few dosages it would be a placebo effect.