This stuff is HARD man. Its tuff but it is workable. You've got to stop the chaos and give yourself some time to take a break to figure all this out. That is going to be next to impossible to do if she's lying in bed next to you texting OM. You need to get her out of your bedroom if not out of the house all together. Then you've got to start doing things to keep you busy. The day after I discovered my W's A, I stood in the parking lot of a movie theater, on the verge of tears as I texted my best friend to see if I could come to town and visit him. I had not confronted my W about the A yet. I did not sleep at all the night before. I was exhausted and miserable but I made myself get out of the house. And I kept doing it day after day. Sometimes, I felt like I was having to take life 1 hour at a time because any more than that was not tolerable. Break it down into whatever increments you can handle. If you need to go walk laps in the parking lot at work, then that's what you do. that's what I had to do. GAL will not magically erase the pain. But it will be far less than if you just sit around and dwell on it.
Me: 48 y/o W: 47 y/o Together: > 20 yrs BD: Dec '15, then S 2nd BD: Mar '16, then I filed for D April '16: started piecing