I can tell that you are really hurting. It is SO hard when someone betrays our trust.
That being said, the very NEXT thing you should do is arrange to get tested for STDs. I know, I know....that part is almost the cherry on the cake of the whole crappy affair. But it is not worth getting sick, infertile or even dying because your husband couldn't keep it in his pants.
And please DO NOT become intimate with him until he has been tested as well. If he wants to kill himself with alcohol or women, that is his business. But you don't need to suffer for it.