How do I manage everything I feel in addition to everything that is complicated/changed?

You feel hurt. You feel damaged. Therefore, step 1 looks inward: you need to take real, personal care of yourself. You should seriously consider finding a counselor to help you through this tough stage. Whether or not you choose to connect with a counselor, there are good resources available. Conquerors through Christ is constantly producing new resources to encourage, equip, and inspire you. COSA (Codependents of Sexual Addiction) is a support program for spouses. If there is a chapter near you, you may want to start attending. These resources will give you a safe place to begin your recovery.