Trying to loose weight!

Tell me how you lost weight. I'd really like to know. I have some type of thyroid problem at the moment. Not sure exactly what I've got to get some more tests done. But I've been gaining weight rapidly and would like to loose some or slow it down. I try to drink a lot of water, and I exercise some kind of way 4/7 days. It may not be much, but it's something right? Haha tell me how you did it!?