Irregular periods with other symptoms

ivalways suffered with irregular bleeding even the pill isnt helping iv tried 5 diffrnet ones. i also suffer with pain too sometimes its sharp but only last for a few secounds then goes normally only get that once in a blue moon but iv had it once before when it has lasted for a day. iv had pain in my sides too.iv always suffered with discharge too and its quite alot more than id say was normall.most recentley iv bin gettin a sharp pain during intercourse but only from a certain angle or if its deep. my symtoms vary all the time sometimes am itchy too not all the time tho and my discharge can vary in colour and smell.iv had a sti check and that was clear so nothing to do with that.iv lost weight too!my hips and knees have always been bad too very clicky and sore sometimes dont know if its related tho. iv got loads of other little symptoms too jus woundered if anyone knows what may be wrong.am going to the docs tho too!