Pain around belly button area?

It started out with one day me noticing oozing or puss (yellow & white) coming from inside my belly button (deep inside) my belly button isn't pierced or anything, and it was coming from deep inside. I kept it clean with hydrogen peroxide and it hasn't been infected of oozing ever since. Now it hurts inside my stomach around the belly button area. It hurts when laying down, when bending down, walking etc. I also feel sick for hours if I eat a medium-large proportioned food amount now. What could this be?