24 and I feel like I'm going through menopause?

The past 2 years I have been unbearably hot in most situations, times when everyone around me is freezing and I'm sweating. I HATE being hot so this is very uncomfortable for me. Around the same time I started gaining weight, although I've never had a great diet. I went from 135 to 170, it took me 6 months to lose 20 of that. 6 months later I have gained it all back. I also rarely get my period, once every 3 or 4 months. I have told my doctors about this but they don't seem to think that its anything, but its driving me crazy. I don't mind not having my period but it doesn't seem normal. I have insane cravings for sugary food also, I don't know if that has anything to do with all the other things that are going on. I also have have problems with depression since I was young, and problems of addiction from 18 years old to about 4 months ago. If anyone has any ideas I would love to hear them!