I had insomnia last night which isn t uncommon. Went to the gym at 5:15. I work out 5-6 times per week, so nothing new. During the warm-up, I felt a little breathless; then I got clammy. I continued workout and sweat much more than I usually do. I felt a little dizzy. Probably should have stopped, but continued for about 45 minutes. Sat out the last exercise rotation. Went home, ate a little and then went to work. I felt dehydrated and just weird (almost numb). I feel okay now, just exhausted. Is this a flu?