Sorry to hear about your situation rc.
First let me say, as others have said, that this has nothing to do with you and everything to do with your screwed-up wife.
"I wish so badly to beat the hell out of this guy!"
There's no point in beating the crap out of the OM. It's not his fault. Your wife made the decision to do what she did. She knew it was wrong and that it would destroy your family but she did it anyway. She's the culprit, not him. If it wasn't rape and he isn't in jail, then she's the one who decided to spread her legs. You nor the OM forced her to ruin the life you, she, and your child had.
"Since all of this I have started eating healthier, stopped alcohol all together (1 month and 2 weeks), wake up @ 5am every morning to workout\run and have sought out individual counseling for anxiety..."
This all good stuff; please keep it up even after you're through this valley of destruction.
"But I still feel very sad, angry and alone. I don't trust her at all."
Your feelings will continue for quite a while; it's normal and she hasn't earned your trust. Until she repairs this, she doesn't deserve it.
"I don't have access to her phone, email or social media. My wife is very strong willed and will never be the type to just hand those things over."
If your wife isn't willing to give you everything that you need to help you feel safe, then she isn't R material. There's no point to marriage counseling or any type of reconciliation (R) until she turns everything over, gives up all of her supposed privacy, and does everything in her power to win you back. There has to be a line-in-the-sand where you are willing to walk away if she won't cooperate. She's done the worst thing you could ever do to anyone and it's her full 100% responsibility to fix it. If she's not willing to give you access, she's still involved in the affair. If she's still involved in the affair, you have two options, live in an open marriage, or divorce her and take your life back.
"I don't feel like a man anymore guys. This is humiliating on all levels. I just don't know if I'm a fool for sticking around and giving her another chance or what."
We've all felt this way. It's normal. You feel the humiliation that your wife should be feeling. It's an unfair situation that takes years to resolve if your wife is willing to put the time and effort in. Your wife gets the best of both situations here. She enjoyed the excitement of riding the other man, and now she gets to enjoy the new thinner more sexually active you. It's a shit sandwich for you. That's why it's on her to fix what she broke.
"A part of me says to give it a shot and see how things go for the next 6 months to a year and if I'm still hurting or unsure then maybe make the call? I just don't want to be left with regret on top of all this pain."
It's okay to give yourself time to decide what you want to do. Just ensure that you're not rushing into trying to get everything back to the way it was. That's where many of the regrets come from; rushing into decisions.
Don't start marriage counseling. She needs to go to IC and work on her issue first. If she won't then divorce her now because you're in for more pain and more other men down the road. She needs to give you full access to every crevice of her life. If she won't then divorce her because she's hiding her activities from you for a reason and it's not good. She needs to be the one setting up the counseling appointment, not you. If she won't make that small effort, then divorce her and save yourself future pain.
You must always remember that your wife is not who you thought she was. You're only now seeing the real person that you married. If you look back you'll see that the signs have always been there but you ignored them; we all did. You must also remember that your wife is no longer the prize you thought she was. You are the prize. You are the only individual in this relationship who has real value. She devalued herself the moment she chose another man over you.
You are the prize. She needs to win the prize in order for you to stay with her. If she chooses not to make the effort, then know that she is choosing herself and sex with other men over you. Don't allow her to devalue you and don't devalue yourself by putting up with unacceptable behavior and treatment. You didn't do anything to deserve this treatment of you and your marriage. Make a plan, draw lines in the sand, set expectations, and outline your future. Set goals and milestones for yourself. If your cheating wife wants to 'tag-along' then she has to meet your expectations, otherwise you move ahead without her holding you back. She made her choices. It's now your turn to make your choices and decide your future.
Take care of yourself. I wish the best for you.