The pain/sensation you're experiencing could simply be some normal body function like your bowels that you happen to be hyperfocusing on. And you're right that if it were an actual problem of some kind, it seems logical that it would be getting worse over time, or you would be developing new symptoms. It's also interesting that it "moves around," which seems like further evidence that it's NOT something serious. It's a shame you can't see a doctor, as a simple ultrasound might be able to settle this issue for you and set your mind at ease. Are you sure Obamacare isn't an option for you? There are also low/no cost clinics in most cities.
Take a few minutes and really let this sink in: worrying is not going to change a thing, but could create problems of its own. And from what you say, the worry is paralyzing your life. My suggestion is to focus your attention and energies OUTWARD onto the people and world around you, not inward on your bodily sensations. Whatever you do, don't lay/sit and ruminate about them. When you catch yourself doing that, get up and DO something -- it could be a fun activity, a project, volunteering, whatever. You just might find that the sensation becomes less of an issue the less you think about it.
I hope that helps. God bless you!
I also suffer with lots of health anxiety! It's tough for me to function on some days :( if I have any type of symptom I automatically think the worse an I always feel like the doctors just can't determine what is wrong. It is a scary thing to deal with an I'm sorry your having to deal with it as well. I sure hope things get better for you an I would definitely check in to some type of statr insurance, to my knowledge everyone is to have insurance regardless of their income. Good luck and if you ever need to talk feel free to message me :)