About A Month Ago I Was Having Some Eye Twiching.

About a month ago I was having some eye twiching. It would happen even before my morning cup of coffee. I am working full time and going to school full time. I just chalked it up to stress. It was gone away. I don't know if it has anything to do with my current problem. I have have dizziness and nausea for the last 4 days. If i stand for more than a few minutes my head starts pounding. I went to the Dr we did cmp, cbc, and thyroid panel. All ok. I am waiting for my insurance to authorize an MRI. I'm kinda starting to get nervious. I am not having any stroke symptoms. Should I just go to ED, go see an ENT, or just wait for MRI?