Weight gain

I cannot lose weight. I worked for 3 weeks straight and lost only 5 lbs, stopped for 1 day and gained it all back. I have givien up. I hate myself and am so sick of it. I had a thyroid test done over a month ago... almost 2 now actually, and never heard anything back. So I don't know whats going on. It all started when I got sick in Feb and hasnt stopped. I want to go off my birth contol so badly but I don't the pain to start again. Though it is anyways. Not as intense as it was but its slowly crawling back up. I'm still at the point where being pregnant makes the most sense, but all the tests say no. I need some suggestions. I honestly dont know what to do anymore. I dont want to give up but it seems like the only thing left.