Nexaplanon HELP!!

I got the implant inserted early August last year(8 months ago) and never had a period until now. This “period” causes bloating and pain that I didn’t even get from a regular period. I used to not get any cramps what so ever but now I cramp and honestly makes me just want to lay in bed bc I feel terrible. I get stomach pain too especially before the “period” starts. So bad I feel nauseated and want to puke. And the period is slightly red and mostly brown - dark-brownish and LOTS of it. I bled for a week and was off a few days and now I’m back on it. Will this ever stop?! Is brown to black period normal? I’d call it discharge but I think it’s way to much to be considered that. Any advice is appreciated ... thank you so much.