weird discharge *HELP*

Ginger
Ok so this is gross *tmi* but my doctor gave me some meds that could cause a yeast infection she said. So I've been getting the symptoms down there that I have been the past 3 days or so. But throughout the day today I've noticed that the discharge is brown almost black getting darker throughout the day. I went to put some monastat ( I think it's what it's called its for yeast infections) in and once I pulled out the applicater black liquid came out, and I mean TONS. It's like liquid and chunky(gross I know). But it's not blood clots since it's almost like diarrhea out of my vag. I had my regular period 2 weeks ago, nothing was different. It's also pretty itchy down there. Any clues to what it may be?? I put a tampon in since I kept leaking. But I've had plenty of yeast infections but not with this black discharge. It smells like regular discharge btw. Any help appreciated!