problema after c section, very worried

:'( hiya i had a c section a year ago but since then my body hasnt beem right. i bled for four months after and since then i have had problems with my stomach etc. i also started the contraceptive injection 6 weeks after i had my little 1 so im nt sure if that is anything to do with it either. my dr doesnt seem to think so. im waiting to undergo tests but im really worried. the injection stopped my period but twice i have had another bleed. this recent bleed started as a propper period then the blood went brown and black then i started spotting nd stopping then strting spotting again, i have had problems with my bowels ( dioreah eg sometimes cant get to the loo in time :$ ) but its got worse as ive started bleeding again. i get cramps, nausea and aches so much more than usual and tonight i havnt been bleeding for around two days and i had an incident where i couldnt get to the loo in time again but as that happened i started to bleed again, but i hadnt been bleedin an hour before as id been to the toilet. after i got sharp cramps, aching and feeling slighty sick. can anyone give me any ideas? would b relly appreciated. thanks x :-)