Hi, welcome to the forums. You might want to check with your doctor about that anxiety if you haven’t already.
I’ve had anxiety my whole adult life. My go-to prayer for it is the Rosary, because I said the Rosary from a very young age and when my mother was anxious about something, like a bad storm outside or the Cuban Missile Crisis, she’d say the Rosary. Apart from all the great help one gets from Jesus through Mary, the repetition of chaplet prayers can be very calming. If you aren’t into the Rosary, then the Divine Mercy chaplet, the Holy Face chaplet, saying the Jesus Prayer on a prayer rope, etc could also be used.
If you prefer Scripture, there are many stories of people in bad circumstances trusting in God, and psalms addressing this, so you could read them.
I also find it helpful to have some go-to saints for help with my anxiety. My favorites for this are St Padre Pio who said “Pray, hope, and don’t worry. Worry is useless. God is merciful and will hear your prayer.” And St Teresa of Avila who wrote “
Nada te turbe” (“Let nothing disturb you”) and was herself an anxiety sufferer. Sometimes I also think of St Frances Cabrini who had a lifelong phobia of water and drowning, but still crossed the Atlantic Ocean 30 times in the course of her life and ministry, and did not die by drowning.
Finally, Adoration also really helps me - just getting to sit with Jesus in his Real Presence.