In the answers to the Common Questions, unless specifically addressing this issue,we assume that there has been both a civil divorce and a Catholic "annulment" (properly called a Decree of Nullity).
He promised never to leave you and left His real, true and substantial Presence available to you in the Eucharist. Especially ignore the counsel to go find a new relationship.
Each situation will require certain steps but for most couples this is a time for patience, practical planning and doing the following: (1) Ask God to help you keep your primary focus on Him and His will for you. Over time they'll come back and the hurt will be recycled.
In a certain sense, the marriage--whether valid or not, salvageable or not--is secondary to your love for and faithfulness to God. Remember: If there's infidelity, addiction or other sinful behavior going on, refuse to let it back into your life and home. It means get help and let your intellect lead, not your emotions (fear, guilt, regret, etc.) (4) .
Start getting help on any practical issues where you need instruction or counseling.
(5) Psalm 4:8 Catechism: Mary's function as mother of men...