Yeah headache is something I get sometimes, I would say now that I'm used to taking it I probably have a headache once or twice in a month. In the beginning switching around the dose you might be sensitive to that and experience some side effects like the nausea or tingling on hands or feet.
Also limiting your intake of ativan is a good idea, the rebound effects of ativan are quite strong and often feel worse than your real stress level. And if you have ever sat there hour after hour, staring at the clock every few miniutes to see if you can take the next dose you know what Im talking about, that stuff is not kind on the body after it does you good. Still taking a couple ativan during a panic attack and going to sleep is probably a good idea if you know its out of control. Using it as a tool is a smart idea, just let your body feel some of the pain rather than squashing all of it, or youll be stuck in a cycle forever wondering when the citalopram is going to start working...which it already might at such a point.
But remember anxiety breathing can cause some symptoms you might be confusing as side effects from the drug so don't be too alarmed at the sensations, tingling, dizziness, fatigue,ect, all these are normal with anxiety breathing. Especially if you have a cold or allergies, mouth breathing with anxiety would just make it worse, but being calm is enough as long as you know what it is.
My therapist had me try a one a day multi vitamin with a dose of sublingual b12 tablet or liquid to be taken under the tongue, which is sold seperately and is not the same thing that is in the multi vitamin. I guess it was a good idea considering my really poor almost non existent diet I had going on anyway.