Ok i need advice...?

I was put on Citalopram for depression....But after i had been taking it a month we had to up my dosage to 40 mg instead of 20.....One day all of the sudden i decided to quit taking it....been about three months and im wondering if i should start taking it again beacause i feel really blaaa.....all the time even have trouble admitting it to myself...I think i am afraid i will turn into a druggie.....any advice?