What Causes Dizziness And Pressure In Base Of Head After Stopping Cymbalta?

Hi, I am a 34 year old female, 5 3 and 110 lbs and was told I have fibromyalgia 5 yrs ago and a mitral valve prolapse. A new dr prescribed cymbalta that I took for a month before I stopped taking it due to its side effects, mainly feeling so tired and out of it. I stopped taking it two weeks ago without weaning off of it. The past two nights I have had a headache, with pressure in the base of my head. I feel very groggy and a little dizzy. I feel as if I have taken a drug, like if I had taken a vicodin or tramadol but the only thing I have taken in the past two weeks is tylenol. I am not overweight, but have a family history of diabetes and high blood pressure. I don t understand why I am having this foggy feeling.