so much pain 😭

okay so i’ve been having this intense and constant pain in my right shoulder, it doesn’t feel like a pulled muscle or tendon because the positioning of my arm does not change the amount of pain i’m in, the pain feels the same no matter how I position myself. nothing feels tight, there’s no swelling, and i didn’t do anything that could have caused injury, just woke up one morning about a week ago and it hurt and the pain has not gone away since. I don’t have any health insurance and money is super tight right now so I can’t go to a doctor but i’m in so much pain and it’s not getting better at all! I don’t know what to do and I have no idea what is causing the pain! does anyone have any ideas on what it might me or any suggestions on what I should do??