hi there, i understand the abdmoninal pains and difficult bowel movments and it could be related to a oravry cyst or endometriosis, im no doctor and im not really knowlegable enough to give any advice but to get yourself to the doctors and dont worry if you have the pain then dont leave it. i never have any bruising when im bad so it might not be but when you go to the doctors be confident and let them know everything your feeling and whats going on and im sure they will help you find the answer to your problem. hope this has helped (even if its not a very informative answer) :D
This could be coeliac disease or ibs,
but the period this is worrying, you might have cysts, so id go see a doctor and get an ultrasound asap! they can be dangerous if they explode in the body, so i really would go asap :)