Welcome!
15 minutes on GYE -- what a great kaballah!
Come here even if you don't screw up!
You're in the right place and you're definitely not alone. Sounds like you're addicted to p* and m*. We don't fight this quite the way we fight other Y"H's, though. True, you need gedarim, like not looking at women, which we shouldn't be doing anyway. But for us, it's a matter of life and (spiritual) death. We are allergic to looking at women. It affects us too much.
You are astute to notice that stress of any sort can be a big trigger to act out. All the more so if your relationship with your wife is part of that stress.
So hammer out a real recovery plan for yourself. Include vigilant shmiras eynayim in all settings. Don't look at any part of any woman except your wife. Not live and not in pictures. Not even their faces. Protect your mind from entertaining fantasies, even about your wife.
Regarding your marital discord, please run out today and buy The Garden of Peace, a Marital Guide for Men Only, by R' Shalom Arush. Read it twice. Here's some tips from the book to get you started: Never criticize your wife. Not even the slightest comment. Never.
Make your wife the most important thing in your life.
Praise her. Compliment her. Be helpful.
Use your bedroom encounters to connect with her, rather than getting high on lust.
Hatzlocha!
Alex