What Causes Vaginal Discharge, Fatigue, Abdomen Discomfort, Burning, Appetite Loss, Stomach Pain?

im 28 yr old female.i got my periods on 20th of february.i got bleeding for 3 days.after tht bleeding stoped but im getting a brown color discharge.i usually get this and lasted for 2 or 3days.but this time its still continuing.and mild abdominal discomfort is thr.aftr intercourse als vaginal discharg is brownish.thr is no bad odour.i feel fatigue.for past 8 months im staying with my husband,planning for a baby.so 2 months back i went for a routine checkup.evrythg was normal including vaginal usg.but vit d was less.so he gave me folic acid and vit d sache also grofer capsule(micronised dehydroepiandrosterone)and productive f (antioxidants,multivit,amino acid and minerals). i was not taking these last two tablets.i started taking these on feb24,exactly after finish bleeding (1 tablet daily)and i took for 6days.yestrd i stoped taking,thinking this brown discolor is due to this tablet.yestrdy aftr intercors dichrge was brown still.today morning also i had the same but more quantity..i feel so fatigue and some discomfort in my abdomen.its not pain.sometime like burning,sometim its ok.my appetite is reduced.i dont hv any burning sensation while urinating.usually during periods time i get very severe stomach pain and it last for 5 days,but this time it was not tht painfull and i had for 3days bleeding..