Yellow vaginal discharge, mild cramping and foul smell from vagina

I've got some questions concerned my personal health. Mainly what is likely going on?

Details:

-Young adult female

-2 weeks ago had unprotected sex, pull out

-120 lbs

-two negative pregnancy tests

Symptoms:

-Yellow vaginal discharge

-mild cramping for 1 week and a half (almost constant)

-foul smell from vagina

-No spotting, no blood at all

-No itching

-light dehydration (having hard time fix)

I have set up a doctors appointment but it's still a while away. Any ideas to what might be going on and what might help?