Hard abdomen

I’ve noticed my abdomen is very hard, I have super bad gas :( I’m on the pill but I freak out every month it’s not working I just had my period last week. So I’m for sure not pregnant as I’ve taken so many tests it’s really just my anxiety. But recently my stomach hurts my lower left side of my abdomen is so sore and hard, I’ve taken gas pills and tried to move to let the gas come out but I’m still uncomfortable, I’ve been to the hospital for this before and they don’t take me seriously, they just kept trying to take blood but they couldn’t they tried a total of 11 times. I don’t know what’s wrong and they can’t seem to find out:( does anyone know of any remedies that could help me? Or have any idea of what this could be?