I went to the doctor fighting fatigue, weight loss/gain and increased sweating. All the blood work has come back OK for hormones, thyroid, etc. I was sent to an internal medicine doctor who is now checking for mono, etc. but is at a loss as to what the problem is. Becuase my breast bone is tender and I had a small cold prior to noticing the increased fatigue, I was prescribed Levaquin to take care of any viral activity that may be causing my symptoms. I took the first pill Friday night at 6:00 with dinner. By bedtime (11:00) I was noticing an pain in my chest. Not real sharp just noticeable and distinct, almost more like a tightening of my chest. I slept well and have noticed them again this morning (Sat.) After talking with my pharmacist and the on-call doctor, I will cease to take any more pills (I only had a five day course 500mg - 1 pill per day to take to begin with) and will be calling the internal medicine doctor on Monday.