This is something that has been a problem for me since my fatigue issues started 2 years ago and it is a big problem for me. Basically all day long I feel fatigued, sore all over, zero energy like I've run a marathon...Sometimes guys have needs..I only do it once every 3 or 4 days average. I do it in about the most low energy way possible, when I do it I feel ok, right after I feel fine, but 3 out of 4 times, about 5 minutes after, its like my body just crashes. I get lightheaded, super weak, feel like I could pass out or collapse any second, shaky sometimes. It is awful, I feel so bad when it happens. I feel bad generally but this is even worse than normal. I feel like its some type of chemical reaction. I know its normal for guys to feel a little tired after, but this far beyond the extremes of that normal. I physically can barely function because I either feel so bad or feel like im gonna pass out. I really feel like whatever is going on with me is chemical, something in the endocrine, or adrenal, or something like that systems. Any kind of adrenaline burst good or bad can make me feel sick, but not quite as much as this.