What Does Severe Pain In Stomach Post Appendix Removal Suggest?

I Just had my appendix removed 6 days ago. I am back at home now as we speak. I have Been taking pain reliefs (maximum strength ibuprofen) that my doctor prescribe only if I needed to... I was fine on my 5th day after surgery. I was eating normally, i do not feel that much pain apart from when I laugh, caugh and lay myself down... I also tried to poop but nothing seem to come out, I could sit on the cubical for hours and the result would still be a failure.. I am normal in the day time but the pain arises in the middle of the night very badly. It occurs around the wound of the surgery (that s the time I consume the pain relief tablet) and it ll be back to normal after that... On my 6th day, my stomach starts to rumble/gurgle after I eat... As it rumbles my stomach start to hurt. The pain start from the bottom of my guts and travel up to my chest .. It feels like something is squeezing my inside .... I also started vomiting after 1-2 hours of I eat a meal . Been laying down on my bed all day. I don t understand what s happening , I have searched the web but couldn t find anything . I am starting to feel like I am the only one who is having this symptom.