That is a pretty quick weight loss from Feb 20th to now. That alone can be very hard on your body......How is your appetite?
i find when i am using i am bigger like a size 7 and as soon as i stop i go fast back down to a 0 too, i think the drugs mess up metabolism alot, so im sure you are fine :)
When I quit using I lost quite a bit of weight as well. I used to bloat up on all the drugs and alcohol and now I'm at the thinnest I've ever been. Some people gain, some people lose from quitting I guess it all depends. Are you working out, do you have an appetite as sudie asked?
how is your appetite? if you are eating properly and still losing the weight i would see a dr. you may need to build yourself up, with protien shakes and healthy eating.