Ahmed,
yes, at least one other man has a physical symptom in the abdomen a bit like yours:
right after orgasm, I have a sensation that isn't heat, but is like something is blocked--or a tube is rather full--just below my belly button. [and fatigue for 5-10 days, some irritability or mild depression]
don't yet know what this physical symptom is, but other symptoms make me suspect I have POIS.