Depression. Worse. what should i do?

I am a 20 year old girl it has been a week now i am feeling depressed like i am overthinking about something which i dont know. 3 years back i suffered from the same anxiety and depression i consulted a doctor and he gave me anti depressents(ambulax hd) . i becam addicted to that for six months than i finally stoped eating it .. I was fine till now but suddenly i am having depression . if i feel tightness or someothing around my head i overthink that yes it is depression become sad about my life and it gets worse.. I again consulted a doctor and he gave me mankind's placida i only ate it for one day i didn't want to be addicted again .. What should i do? When i am in my college i don't feel anything but when i come back home heaviness around my head comes along and i feel depressed