I forgot something I had already post before. It is no a tech for stop cum, it is only a way to help us when we are almost near and to see easily than the explanation of these kind of books is wrong: they are no problem for cumming as times as you want. You will no become ill...Fortunately they are different kind of aneros. If I don't remember bad the one you have is the smallest.
The most important is avoid
Although you have no these awesome orgasm, you should enjoy or maybe no feel anything (at the beginning it can happen until your body reacts), but never pain.
What happened is you had a retrograde eyaculation : it can be from pleasant to feel it uncomfortable.
This is one of the reasons I always say people they must be careful with the tech they use.
And example is what is suggested on Mantak Chia's books : press on the 1m point until you can make nothing pass on the tubes.
It has no sense as it can hurt us.
I don't know why they tend to mix physical techniques with "energy" one.
Simply wank (it is better a fast one, almost the first time, than while edging).
When you feel the cum near, than you are near to arrive to the ponr, halt the stimulation.
Press the muscles you use to force the pee (the one we press when we want the pee goes faster).
The cum should go out without you feel nor orgasm not triggering the eyaculation.
You can go on (also repeat it as times you want) BUT you must be careful as after doing it, the cock becomes more sensitive and it makes harder to having the hand far from it.