Problems with weight loss after Zoloft/Inderal/Klonopin

I'm wondering if anyone else had trouble losing weight after Zoloft/Inderal/Klonopin. I was on all 3 and they caused me to gain 20lbs in 3 months. I have been on a very intense diet for 2 months and quit cold turkey on my meds about 3 weeks ago after my doctor told me they were the problem (after being mistakenly diagnosed with hypothyroidism).

How long does it take, on average, to get the meds out of your system and start losing the weight?
I've been "underweight" all my life so it's very frustrating because I never indulge in any type of "pleasures" involving food and never have so it's like my body has betrayed me.

I'm getting laserlipo to supplement my diet and exercise but Im not expecting much.