Muscle twiching or nerve problems?

Im a19 year old female, and a while back when i was in the 9th grade i used to get picked on. To make the long story short i missed a lot of school and eventually was in truancy court which did no good because i still didn't go to school . So i ended up going to a foster home which i ran away in was so stressed and scared what can happen if they found me. I mean i was so stressed ,depressed and ful of anxiety that it started to make me go crazy, and i started having these weird symptoms, were my legs and almost every part of my body that have muscles start twiching. I went to the doctor twice about this and they keep telling me nothing was wrong and that i need to eat bananas and green food which did not help. Whether it's my imagination or not it seem to worsen and i notice that it only starts when i'm relaxing. Can any one please tell me what this can be and what can be done about it?