Yes you will feel normal again. It won't be easy or quick. You just keep working on yourself and value yourself.
Your story is terrible, a nightmare. Hugs. Your WH's lack of support and selfish adolescent behaviour during the affair is unforgivable. When you needed him most he started escaping by thinking with his little head,and you have every right to be frustrated.
I was M 30 years and he left for his secretary who is 22 years younger than me. I understand your frustration about how he had the "time" for her.
Until your WH agrees to be transparent, R cannot start. It may help to read about the 180 (Healing Library BS FAQs#11). It will help you gain the strength you need. Hugs.