2 years ago i smoked synthetic weed and got very dizzy and every since i still get these headrush falling feelings why i take celexa (citalopram) for anxiety now?

Can't say for sure.: Cannabis ( to include synthetic versions) has been known in some to trigger mood or anxiety disorders. This may be the case for you.

Synthetic weed: Synthetic weed is even more unpredictable than regular, which can be problematic enough. Both can induce paranoia, panic, & psychosis. The synthetic version is unidentified herbal material sprayed with varying quantities of synthetic thc-like substance which may change just ahead of laws in your state. It's very hard to keep up with these different molecules, in which effects may differ. Danger.

ANXIETY: The drug reaction must have been traumatic for you and the memories provoke the fear. There is extra anxiety due to covid 19- stay safe, cautious & hold on to hopefulness. 1st have a physical exam by a Dr. to know if you have a physical illness. Please consult with a Clinical Psychologist for psychotherapy with Zoom sessions to learn to overcome the fear & a Psychiatrist for medication.