citalopram/Celexa question

I have thrown up three times in the past month. The first time was December 12. This bothered me because I think I remember throwing up one other time in the morning a few months ago. Then I felt just fine after that. Then I threw up yesterday morning and this morning. I had a different food for breakfast this morning that yesterday. This morning's breakfast was left over pizza from last night which didn't bother me last night. I left a message for my Pdoc's nurse. However, I am not sure if this is a general practicitioner issue (normal medical problem) or a drug side-effect. I am also starting to wonder if I might experience withdrawal symptoms because I always take the pill in the morning. I mean if I can't keep my breakfast down after taking the pill, how can I keep the pleasurable effects of the drug (helps me sleep, helps me be less negative in my thinking etc)?