Hi, I'm A 29 Year Old Female. I Had What

Hi, I'm a 29 year old female. I had what I believed to be a cold a week or more ago and that "turned" immediately into more virus-like symptoms. I have a constant, severe headache (including neck and jaw pain), abdominal and back pain, body aches, diarrhea, and a temperature here and there. I'm concerned because my symptoms do not seem to be improving. I'll have a fever one hour and be shaking with the chills the next hour, and I'm in constant pain. Is it normal for a virus to last this long or should I seek medical attention?