What Causes Severe Vomiting And Pain In The Back?

Hi. I went to dinner Saturday night. About 3am Sunday morning, I woke up severely vomiting. It continued until after noon that day. I had to go and play music that afternoon and was sitting down so I was able to pull it off, but had a lot of pain in my back, stiffness in my neck and felt like my chest was full . I hadn t eaten anything at all. Haven t had a lot of rest since then, despite trying to, and still feel tight and full across my chest, back and have stiffness in my neck. There might be a low grade fever, but I don t feel bad . Just tired.