Nexplanon question

Colianna-kay
I was on my period for 100 days then it stopped then a week later I have alot of brown discharge and feel like I'm baloting like my pants hurt to wear because I feel like their pushing my belly in alot anytime i eat I feel slightly sick after and I keep wanting to just unbutton my pants or wear stretchy yoga pants everywhere and my lodes are hurting some by my stomach/pelvis area both sides-fyi- im 115 pounds skinny mini