Been on Citalopram for 2 weeks now. Anxiety makes me nauseous and in very emetophobic. How long until nausea goes away on these tablets?

Can't say for sure - But would recommend talking the citalopram with food. If this doesn't do the trick would recommend a timed- release probiotic with millions of colonies.
Check with your doc. Unfortunately, this medication's side effects do not have the tendency to get "better" as time goes on especially since you've been on it for 2 weeks. I would check with the doctor and see if maybe switching you to either a lower dose (if possible) or another agent would be recommended.