His and Her Health

i have had a yellowish vaginal discharge for 18 months. my original ob/gyn tested for all the usual std's and all were negative.that dr. told me to just wear a tampon everyday. did that for about a year and it made menervous. sometimes the vaginal area is painful or swollen. i walk like i just got off a horse. i have had 3 or 4 uti's in this time period also. they seem to aggravate it. or are they the cause? i saw a new doc and she mentioned something about that but didn't ellaborate. tried to get back with her but i've been having trouble. also could this problem be diabetes related? thanks for your help.