Wow people, will anyone NOT assume stuff please? Half the posts here regard his choice rather than the fact that he ISN'T FEELING WELL. He didn't say why he decided to give it up, no need for lectures on whether masturbation is good or bad.
On topic, I don't believe there is such a thing as "masturbation withdrawal symptoms". I'm not an expert on the topic, but if it does rid your body of certain stuff that is otherwise in it (I don't know, but if it does, the following would make sense), it could take your body a little to readjust and produce lower amounts since it's not getting rid of them the way it did before.