A while ago I noticed a little pain on the right side of my lower back. I felt around and thought I felt a little knot. Now the pain remains only worse and it feels like a golf ball size lump. I had a cat scan on my liver and it was fine then took the meds n pain remains with lump go to hospital again and they said if there was something there it would have showed in cat scan. But I swear something is there what could be wrong?