When I was in 6th grade I got my first period and back then it wasn't that bad, but now that I'm older, it's different. I have a very heavy flow, and on the first day, when my period starts, I get extreme pain in my mid and lower back. It hurts so bad that I sometimes can not move, also I get extremely depressed on the first day. After the first day, the depression and pain subside a little bit but then I get a very sore feeling in my upper thighs and all throughout my butt and crotch. I was wondering if this is serious because it hurts so bad I just feel like it has to be. Advice and thoughts would be appreciated, if anyone else goes through this your not alone. Thanks in advance!