NEs don't follow any kind of rhythm for me. One time I didn't masturbate for 30 days, and never once had a NE. One other time I masturbated, and had a NE the very next night. I think it depends on a number of factors: the erotic content of your dreams, your need for release (physical or psychological) , and the strength of your kegel muscle! I had my first ever wet dream when I was 19, and it was after a couple of days of kegel exercises, which I had never done before.
And yes, NEs cause POIS symptoms with me too. But I usually masturbate too frequently for them to happen. Because in a way, I feel extra shitty when I've had a NE because I have POIS symptoms but didn't get to enjoy the orgasm!!
So my current motto is, try to delay ejaculation for as long as possible... but if you really HAVE to, at least make masturbation into an enjoyable event... draw it out, watch some good porn, etc. So at least it's kinda worth it! Nothing is worse than just throwing an ejaculation down the toilet out of frustration. Believe me I've been there!