What Causes Swollen Vaginal Opening Along With Thick Brown Discharge From Vagina?

I have been experiencing some very uncomfortable symptoms they are as follows: red and severely swollen vagina lips, intense burning, off and on tingling, off and on stabbing/itching, thick dark brown discharge, off and on Pukey feeling and blood. I m not on my period at the moment so I don t feel like the blood is from that. Also, I ve had these symptoms before and went to many doctors tell me that it s a yeast infection. They ve given me diflucan twice now, first time it worked great, almost overnight even, but this time around they gave me two, one to take home and one to take then. It still hasn t worked or shown signs it was working. I had a son back in September of last year, and I only have one sexual partner and we haven t had sex in a few weeks. I plan on going to the doc tomorrow, but some insight would help immensely.