Firstly details about your current state of anxiety will be helpful. The symptoms you mentioned can also be(among other factors)
due to the drugs your taking.
Next Steps
if you are relatively free of anxiety, you can either stop serta directly as it's a small dose or take half tablet for 15 days and then stop.
Health Tips
in case your current symptoms continue , or have recurrence of anxiety symptoms, suggest you to have a online consult with me