flu like symptoms, please help

Hi, outside of responding to a couple messages yesterday, this is my first time ever using a board or blog. So please excuse my inexperience if it stands out so much or I accidently offend anyone. Can someone help or shed light on the experience I am going through and would like to explain? It started last June 2010. I simply thought that I had the flu. The only difference is that it took 14 days before all symptoms were gone, and I felt 100%. In Jan 2011 I had another bout that was exactly the same except for it lasted only 4 days. Each time the symptoms were almost exactly flu like. Very High fever (starting over 102.5 every time) muscle aches, shivering, very weak, severe sweating, and vomiting. It came again in late Jan and I decided it was time to see my MD. She ran her tests and could only come to the conclusion that it is due to such a severe flu season. Now from the end of Jan up to today, I have caught this thing 9 more times and each even though it is only lasting 2 or 3 days each time, it is so powerful. One waking with 104 fever. I have now seen 3 MD's and all are baffled. My family MD still thinks I have such a lowered immune system due to 1 total hip replacement failure, and 2 revision failures in my left hip all in 3 years, that I am catching the flu. But none of my loved ones or friends around me are getting it. I should also mention that prior to last June, I have never had the flu. Any similar experiences or information provided by anyone would be so very appreciated! Thank You!