It's good that you've sought out medical assistance if you feel you have a physical problem, maybe you could request to see another doctor if your current one doesn't seem bothered about your health issues.

If it's more of a subtle mental thing going on i don't think that believing you're cursed is a great outlook to have about it, of course if it's a real problem then it's good to seek help, but sometimes believing there's a problem or looking for a problem, creates a problem. Rather than believe in this kind of thinking, you could question whether these thoughts and doubts are about anything true. Having a clear mind can help more than adding belief onto things.

I hope you find some peace soon