Vertigo-Severe & Mild

I have had Vertigo 3 times, the last started in Dec. 2008. The room was spinning for nearlly 4 months. The dizziness & nausia has not stopped since. I have since found I have diabetes (type 2) and Kidney disease stage 3 and I also had stens put in, in June 2008. I am also lethargic all the time. I have fallen asleep for a couple of hrs almost 3-4 times a week. I have no concentration and my memory is non-existant. I still have wake up with the feeling of the room spinning and when I close my eyes, my body feels like it wants to be upside down. Could it be vertigo still or is it my meds?