My husband was on a cruise ship at sea, the 2nd day of our trip, He was at the pool reading a book for abt. and hr. or so, around 12pm. He suddenly started to get chills, and chattering teeth, by the time we got to our cabin, he was freezing and had a very high fever, and bad headache, after a few hrs of tylenol around 5or 6pm his fever broke, The next day he was fine and 7 days later, he developed a fatigue and achiness all over, but mostly in his neck thighs chest and arms. He has been sick for 7 wks, no energy, He is now on prednisone and feeling totally well again, what do you think he had? We have not gotten a dianosis from any Dr. yet.