My stomach hurts and my lower back hurts. If i eat any more food i will want to throw up. I couldnt sleep well last night due to the stomAch and lower back pains. Now i also cant poop. 2 years ago i had similar symptoms and was just very constipated from eating a lot of mac n cheese. However im concerned i might have an appendisitis because the stomach pain is now going towards my left groin area under my stomach though the pain isnt severe i have a feeling it can turn out to be. How do i tell and what should i do?

Summarized question: Stomach pain towards groin, back pain. Appendicitis?