This is probably POIS. Check out r/POIS, full of people who get sick for days or even weeks after ejaculating/orgasming. This is not so outrageous considering that ejaculation is only meant for procreation is not your personal pleasure fountain that you can abuse without consequences. Men who abstain for longer periods are affected more by ejaculation because they are on a different energy level (spiritual, physical) aswell as their bodies not being used to being completely depleted of sexual energy like most men are constantly. People with especially frail nervous system that you see having POIS cannot even cope with the strain of one ejaculation. Even for not sick people, ejaculation is often linked to similar symptoms like fatigue and inflammation. Abstaining men often need more than a week or weeks to fully recover from complete depletion. You only feel the loss if you had something to lose.