Effectiveness of Belviq after finishing Phentermine

I tried Belviq about a year ago for about 5 months and did pretty well, but then again I was also eating well and exercising regularly. I had no effects from it at all. I never heard about only allowing to be on it for 3 months then off. But I wasn't able to get a refill because I wait over 37 days from my previous refill (Ohio law: if you go over 37 days you can't go back on it for 6 months and I kept forgetting to take my 2nd pill). So I started on it again in Oct. 2016 (I had gained back some weight, my fault entirely, not the drug) and this time I had headaches for the first 2 weeks. My doctor gave me 3 months at a time, then I would go check in and weigh in, then get another refill for 3 more months. When I went to get my latest refill on Feb. 9, the pharmacy said my savings card expired. Long story short, I couldn't get the drug (because I wasn't paying $260 a month for it) and I've been experiencing major withdrawal. For 3 days I was experiencing a lot of confusion and couldn't focus. My heart has been beating very fast, in fact I just went to the dr. today to have it checked out since I woke up with major heart beating and sweating. I'm hoping it goes away soon it's been 1 week now. Bottom line: I think it helped, I can't really say for sure. I did lose 6 pounds, but as before, I am doing what I should be doing anyway. I regret taking it though, based on how I feel the 2nd time around.