I feel like I will explode but...

I feel like I will explode. I feel a point that is very pleasurable. The prostate sweel and the point becomes so much more intense. I don't know how much more I can get until I explode then I can't hold anymore I force myself to breath deeply/normaly instead of holding more and more.
As I do that I lose gradually all the sensation. I missed the train and it won't come back. I try again to reach that point and minutes passes until I decide to stop.

It's my third attempt and the last I really though I was about to reach anal induced orgasm.
Shall I keep contracting? Not being distracted by my breathing might be the solution but it keeps coming to my minds.