I'm very sorry you may have found some information leading you to believe your wife is having an or several affairs. I understand why you are unhappy. However, you have located a site which can and will give you the support you may be looking for....
Come on in and introduce yourself. How long have you been married, do you have children? Up until this point, how would you describe your marriage? What are your ages? How did you come across the information leading you to believe your wife is sleeping with several men?
Let's get to know each other and see where we all can support each other.
Jeremiah 29:11 For I know the plans I have for you.........
Now there's a tough blow, to accidently come across something like that must have taken your breath away. I can understand why you feel sick.
Now put the tape away, there's no reason to punish yourself by watching it over and over again. Understand, her actions are her actions, and have no reflection upon you, as the person you are today.
I know it's going to take a long time to recover from this, it's a hard blow at best, and you need to take time for yourself.
Come on back when you need to reach out, need some comfort, or would like to express how you feel, I believe if it were me, I'd have plenty of feelings to express, and for quite some time before I'd have my head cleared of the many emotions I'd be feeling all at once.
Keep breathing, slow deep breaths, and tell yourself you are going to be fine, yes it may take some time, but you will make it through this all in one piece.