Just wanted to share my lightheaded/dizziness story with you. I was on Celexa for anxiety for more than 10 years. I got very ill a few months ago (unrelated to meds or anxiety) and had severe GI distress. I was started on pretty heavy acid reducers, and had to be taken off Celexa cold b/c of possible serious interactions. I was switched to Prozac. Three weeks later, I woke up dizzy - for the first time in my life. I kept having the feeling you get when you stand up too quickly and get a head rush - a few seconds of disorientation, weakness, feeling faint, etc, that would resolve within 5 seconds or so (just like a head rush). The problem was I was getting these at least 10 times an hour while walking around. Fearing it was the Prozac, I came off all SSRIs.
It didn't resolve. I did A LOT of research, saw a lot of specialists and had a lot of tests. We were down to two theories: anxiety related dizziness or migraine associated vertigo. It turns out I do have MAV and it's from stopping SSRIs.
My point is that all of the specialists I saw had seen many patients who were dizzy simply from anxiety. It is very possible and well accepted throughout the medical community. Talk with your doc, get the tests you need to clear yourself, but just know that, yes, this can all be anxiety.
I really hope you feel better. Personally, I am restarting SSRIs tomorrow (Lexapro) as both an anxiety and headache preventative.