Appendicitis or is this seriously bad?

[Taylor727]

I am experiencing extreme pain 2 inches on the right from my naval and a constant dull aching pain in my flanks in the back in the sides non-stop today would be the 4th day of all this going on... everyone saying I should be at the ER but I am terrified of hospitals. My pain is constant in my back on the sides like the flank area and that's a constant dull ache it radiates to my abdominal but there's a sharp pain that goes straight through to the back area from the Right side of my abdomen two inches from my naval ...it's nonstop the pain intesified so badly that my head throbbed (like a svere migraine headache I have never had issues with migraines) and I got very nauseous and vomited brown bile on and off for hours. I'm not vomiting now but the pain is so bad and that it even hurts to breathe in or cough or move...is this appendicitis or something else that can be serious..?? It didn't start around my naval it started on my sides/flank area and more intesified as days went on and now the pain is locally two inches from naval on the right side of abdominal area...any advice would be appreciated