Bladder, Vaginal, and anal pain.

So for the past few days I've noticed discomfort in my bladder. It hurts a little bit and then I have an urge to pee, but when I go, only a little bit come out. 
Also, during these bladder pains, k get cramping in my vagina and anis at the same time. 
I went to the doctor and said everything looks normal, even my pee. 
And I took a pregnancy test which resulted in a negative. 
Has anyone experienced this before?