Sometimes I will feel weird after a workout. This doesn't always happen, but it just happened today. I got to sleep a little late last night (2 am). This morning I had 2 pieces of toast with peanut butter about an hour before I worked out. Maybe I should have had more food? I lifted, did abs workouts and did high intensity interval training. I was feeling really tired after working out and almost so tired like I would faint. It went away about 45 minutes after I got home from the gym. I fueled up on an entire container of cottage cheese.