sorry to hear that u dont will be able to be together and u need to do much of the job by yourself.
Anxiety is really a hard thing to come over, what so ever is causing it. The things u are feeling are not strange, it seams all natural and direct healthy in my opinion. Feelings is something good, even if we feel sad, anger or anxiety. the feelings tells us something and that we need to vent and take care of. Often life is coming in between and hinder us from taking time for these feelings and deal with them. I cant understand fully your emotions and feelings, but i can tell u it can be better, and it will probably will, as long as he quit PMO.
One thing I have learned from my anxiety is that i need to stay at my half of the field. A relationship is always two sides, and when we are close to someone, we often (well at least for me) want to go over on the other person half and help them. We call it love and caring. But imagine a goalie in soccer, who start to go from his space and start to tell the midfield how to play. He may have right and be correct about his opinion, but he will risk to fail at his own work, if he concentrate to much on what the midfield should or not should do..
U and your husband are in the same team, even if it not always feels like it. Me and my wife have come up with some rules, and we have been working hard to vent our emotions when needed. Its okey to feel what ever we feel, and we can act upon our feelings as adults, and talk about it. My wife need to tell me if she is sad or lowly. And i need to do the same. Its not easy when u feel betrayed.
When my wife was cheating on me during one of my deep depressions, i was devastated. We talked about it and then i made up my mind to forgive her. After that i did my best to show my love to her, because i believed she was feeling like she didnt have the right to be loved by me. I believed that if i not do my work to support her and make sure i show my 100% love towards her, it will be more difficult for her to come over her feelings. But i never stepped over the line, she needed to do her things. She needed to make the decision and make the actions to stop seeing her lover. So she changed her phone number, quit her job, even if she didnt have a new one. And then she started her "new life".
What i wanna say to you is that dont feel guilty for not doing enough and like its on you that he PMO. Its his responsibility. and make time with your man and set up a new life together, do your part, and if he fails, sit down again and make a new plan, that better fits your lives. One of my favorite quotes are "if u do the same thing today as u did yesterday, u will get the same results as yesterday, if u want another result, change your actions" and Jim Rohn "If you don't like how things are, change it! You're not a tree."
U cant stop him from PMO, and he cant help you with your feelings. We all grow from within, and when we are in balance with ourselves, we are able to enjoy life even when bad/sad things happens around us. The best advice I can give is to find a way to love yourself and that will help u recover and feel more happy in life. Its not good for anyone who relay on other people or things for their happiness. Your husband need to stop seek happines thru PMO as someone need to stop work and buy stuff for happines. Or as for me, i need to stop focusing on have close best friends, like i need them to be happy.
U are doing great, and its all fine to be anxious, sad or angry, its part of life and it tells u something. Whar does it tells u?