Missjournalist, please be aware that AnnieBrooke is trying to help you. She has a lot of knowledge and has been patiently trying to uncover some avenues for you to look into or consider. If your doctor thinks you have PCOS, are you going to begin being treated for it? My mom had non stop bleeding and troubling periods because of a lack of progesterone. You have had that checked and not the case for you? Are they sure you don't have an ovarian cyst? Your symptoms are actually those of an ovarian cyst as well. That was my first guess. When I had one, I had similar issues and when I finally passed it, it was the worst period of my life and very painful. Since they are suspecting pcos, what is your next step in diagnosing that for sure?
If you really have a uterus that is malformed (that's a big if), it could cause you problems with your period. But so could other things. Can you get insurance? I'd try to make it a priority, even if it means searching for a different job that offers health insurance as a benefit. You need a clear diagnosis.
In your shoes I would request an abdominal MRI, not just an ultrasound. You need a better idea of what is going on with your uterus. If the MRI suggests tissue samples, one small sample is not enough, I'd request whatever it takes (including sedation) to get what they need. But it sounds, from your description of having "half a uterus," like you need further clarity on the state of your uterus, and for that an MRI is called for.