Lower Pelvic Muscle Contractions

I have been looking this up for weeks and have not found anyone else with the same symptoms as me. I don't even know what doctor to go see. Every time I go to the gynecologist with something, she thinks i'm crazy. But then again I only go to a planned parenthood clinic, I do not have insurance to cover a good gynecologist. I have not gone for this particular problem but here are my symptoms.

I have been constipated for over a month. When I do have a bowel movement it is usually very small and hard, or I get diarrhea. But never enough to feel like a real full bowel movement.

I don't know if these go together, or if they are two different problems, but what is bothering me the most is. I am having muscle spasms or contractions like in my lower pelvic. It is like im squeezing in down there, it is in my rectum and vagina. It is involuntary. It doesn't really hurt, but is very annoying. And is causing some cramping because im constantly squeezing the muscles down there. I dunno if they are like spasms or contractions. This is ALL the time, Every 5 seconds or so I get one.

These muscles squeezing like this makes me feel like I have to use the bathroom all the time, and is very uncomfortable. It seems to be better when I am standing up.

I have tried stop drinking caffiene, that did not help. I ate banannas, drank lots of water, gatorade, putting a heating pad on my rectum and vagina while laying down. Nothing has stopped this. It is going on 2 weeks or more.

I am not pregnant because I had my period last week. And I thought that was maybe causeing my spasms/contractions, and figured it would go away after I had my period, and it has not.

Please Help!