I have been extremely light headed and a little dizzy over the past few days.
I am going to the Dr tomorrow but am interested to see some different opinions.
I have been taking Lexapro but have missed the past week and a half as I ran out.
Am wondering if this is the reason for the way I am feeling.

It could be the reason.
I was taking Paxil for awhile and quit taking it because it was making me feel weird and then I started hallucinating for nights. I ended up going to the ER and they said it was cause I quit taking it.
So it very well could be withdraw. It is good you are going to the doctors tomorrow,
Make sure he checks your blood pressure. If it is low eat throughout the day. I am going through that myself right now.