im extremely shy... im too shy to talk to people and i cant make friends.

i worry too much.... i have 1 friend who i am afraid of losing, i worry too much and lately ive been getting upset at her all the time for the smallest things. we've been having huge fights and she keeps ending our friendship and i get all depressed and cry and scream and abuse her with text messages and everything.. i feel out of control. lately shes been getting closer with one of her other friends, and that burns me so much..

ive tried therapy but it didnt work

i started taking antidepressants last week
how will they help me and in what way? will my burning feelings about my friend getting closer with the other girl go away?