Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
Your marriage is valid and you are lawful to each other.
In his response to your question, Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states:
If you were married in a Catholic church before your reversion to Islam, you don’t need to worry about the validity of your marriage. Christians married before entering Islam were not required to renew their marriage vows.
I would also urge you to offer the following supplication as often as you can:
Allaahumma yaa muqalliba al-qulub thabit qulubana ala al-haqq
(O Allah, You are the twister and turner of hearts; make our hearts steadfast on the truth.)
Almighty Allah knows best.