Need answers!!

Amber

I’ve been having some weird symptoms going on and wondering if anyone on here may be experiencing the same thing or have an idea of what it could be. The last 6 months I have gained a lot of weight super fast, I have had digestive issues so bad I’m constantly going to the bathroom, I’m severely fatigued and have no energy, I have abnormal discharge which I’ve been tested for STIs and STDs and all came back negative and then this month I missed my period. I am not pregnant, I have ruled that out. Could this be a hormonal imbalance or something more serious going on? Any advise would help! Thank you!