I'm unable to stay calm and think.

I(23M) am always thinking and I cannot stay calm. I have extreme anxiety to the point my gut is affected.

I always extremely anxious and I cannot think straight at all. My perception of time is messed up sometimes and my emotions are extreme. I cannot sit and figure out things calmly.

I'm making fatal mistakes and suffer because of them. My academics are being effected, relationships are getting worse. I'm unable to do things like a normal human.

I've been to a therapist and he suggested I have anxiety and depression. He also doubts it could he ADHD bit doesn't bank on it. He prescribed me Lexapro and Propranolol.

How do I proceed with everything?