Suggest Treatment For Severe Headaches And Pain In Tailbone Area

I got into an accident on July 5th. I was standing in the back of rv when my husband had to slam breaks on to avoid accident. This caused me to fly towards the front backwards and hitting my tailbone on huge piece of metal bar. I felt all my stomach insides go all the way up to my throat. Right after impact I became extremely nauseous and severe headache and tailbone pain. After a couple of days I went to primary dr and he just said I got banged up. After that my whole abdomen became very painful and into my back. Also my left rib cage is severe pain too. Went to ER 3 weeks. They did urine, blood and ultra sound and that came back normal and sent me home with pain pills which I do not take. I m getting worse with on off fever 100.3. Diarrhea which I go at least 10-15 times a day even tho I m nibbling on toast, can t and don t want to eat. Lightheaded. I ve lost 8 lbs which brings me to 105.5. G.I. Dr did ct scan and that came back normal. Now he s wanting to do a stool test to rule out bacteria infection. That puzzles me considering all this pain started the moment after blunt force impact. I m sure I m missing more details. But that s the main issues. What is your opinion? Stacey Jackson