please help ❗️

I was started on Citalopram 20 mg once a day and Buspar 5 mg three times a day three days ago. 
Yesterday I felt awesome. The only thing I can compare it to is being on adderall. focused, productive, upbeat. 
Today I feel so jittery it's making me sick. I'm super anxious and I had a panic attack this morning that made me vomit. I've lost my appetite entirely and can't sleep for shit. 
I called the doctor and she said to quit taking the Buspar and that we'd try another antianxiety on Monday when I go in for blood work. 
How do I flush this shit out of my system?? Has anyone else had this reaction? I feel absolutely horrible.