15 weeks and anxiety

Hi mommies. Before being pregnant I have been battling anxiety for over 5 years. I was on lexapro 20 my and I was given 0.5 mg Xanax to take as needed. Now that I'm pregnant I can't take Xanax unless absolutely necessary, granted that my dose is very small (I haven't taken it yet being pregnant) and the doctor lowered my lexapro to 10 mg. Every now and then (I am experiencing it right now) I get anxiety and heart palpitations. I feel like upset and scared but mainly the palpitations and anxiety are what stands out most. Anyone recommend anything that isn't Xanax? Thank you.