Honestly, you are handling this much better than you think you are. Nobody here handled it brilliantly when they went through their own troubles, because for all of us, it was the first time we were going through it, and we had no previous experience to guide us.
I did things that I would not do now, simply because I did them and they did not work, but the internet and this forum was not around when I could have benefited from them. Also, just as a wayward spouse may be in a 'fog', it is not uncommon for a betrayed spouse to be in a daze. Infidelity can leave a person with emotional concussion, and it can be hard to think straight.
Where this forum comes into its own is that many thousands of people have posted here through the years, and it has become a kind of repository of all their experiences and actions. That has created a shared storehouse of wisdom about what to do, and what not to do, in the aftermath of infidelity. It is true that some of the suggestions may not be 100% right for every single case, but honestly, a lot of the suggested actions can be applied to 99% of scenarios.
However, being hit by a tidal wave of advice can be hard when you arrive in the forum, hurting and dazed, just wanting your old life back, and wondering how the hell things changed so much. Sometimes we forget that, and some of the advice can leave a hurting or vulnerable person who has just arrived feeling almost like they are under attack. Honestly, that is never, ever the intention. It is never meant as criticism, it is a crowd of people shouting, "Be careful! Don't do that!", because they probably did it themselves, and they know that something didn't work. So they don't want to see you doing the same thing.
Although there are actions that may or may not be recommended, the emotional element is much harder to handle and control. We all went through our own version of what gets called 'the rollercoaster', with all of its highs and lows, and there really are no magic cures or quick fixes for it. The one thing that I did learn is that it helps a lot to open up to people, and not try to tough it out by myself. There is no shame in reaching out, or in admitting to feeling hurt or lost. Many people here have done just that, and they all benefited from doing it. So much so that they decided to stick around and try and help others facing the same challenges that they faced.
It is good that you have spoken to so many people about what has happened, and also that you have spoken to a counsellor, but if you find you are being impacted physically, through lack of sleep, or lack of eating, it may be wise to visit your physician and explain your situation. Also, there is a forum here called 'General', where people often start posts about things like, "The nights are the worst", "How did you get through it?", and you can get lots of feedback from people who may have found fixes or techniques that might work for you.
The reason why filing is recommended quite often in these cases is that it can shake a wayward spouse out of their fog, and make them realise that they are not having some fantasy adventure, but doing things that have real consequences in the real world. It focuses them on whether or not they think what they are doing is worth it. Sometimes they relent, sometimes they do not, but either way, it prevents their betrayed spouse from being left in limbo by a wayward spouse who might otherwise spend months stringing them along and saying, "I don't know", "I'm not sure", etc. In a way, it is forcing the wayward's hand, but a betrayed spouse has only a limited array of options to try and get something approaching honesty in a situation that developed out of dishonesty.
As I say, you are doing better than you think, and just as well as any of us did when we had all of this stuff dropped into our lives. We know how lousy it can be, which is why so many of us stick around to try and help others through it. There is not a lot that can be done to stop it hurting, but the collected wisdom here can help to limit the damage caused by infidelity, and to advise about actions that work or tend to backfire.
You are not alone, and we are thinking of you. You served your country in the service, maybe we can serve you. I hope so.