Tried celexa (citalopram) 5mg, day 2 worst anxiety of my life stopped meds, why am i so sensitive to small dose? i am not the norm- scared to try a new med

Unusual : Your reaction is relatively rare, especially on such a low dose. As far as I know the smallest dose celexa (citalopram) comes in is 10 mg - so are breaking the 10 mg in half? Also, are you taking any other meds- prescription or otherwise? Had any liver problems? Have you experienced anything like this with other meds? Have a conversation with the prescribing doc to figure out what the issue/s might be.