Im a 23 year old male. Since last April I started having severe back pain opposite of where my stomach sits. Its near at the bottom of the ribcage on back left side. I have added a picture of where the pain is. (The red circle is where the back pain is around and the arrows are where the pain radiates up into my shoulder blade causing pain). I went to doctor and chiropractor and they said its probably a muscle. The pain got less severe over the summer but there was still constant pain. I went to the doctor again in October and they did a full blood count, liver, pancreas, gall bladder, and thyroid (everything came back normal) and said it was probably muscle again.
The pain has always been constant and hasn't improved or gotten worse. Its in the same spot on my back and seems to have been affecting the left back and left core. Its stayed pretty consistent in pain and I'm always uncomfortable. Also starting 3 months ago I have pain that radiates up into my left shoulder blade, which concerns me. My shoulder blade seems to always be in pain too now. Last, when I work out and do sit ups, the right side of my abs only burn. My left side of my core doesn't seem to work and or burn when exercising. The pain feels like its deeper inside my body but i can't tell.
I am worried that I have a sarcoma or some other tumor that is pressing on nerves and muscles in my back. I don't know if i should go back to the doctor cause Im scared. The pain hasn't gone away since last April and I'm scared to death to find something bad. I haven't had any symptoms like fatigue, night sweats, fever, swollen lymph nodes, or weight loss. Only thing i would say is that I don't have an appetite anymore.
Anyone have any suggestions what I should do? My Health anxiety is through the roof right now.