What Causes Nausea And Dizziness On Waking Up?

I had a massage on Saturday, about 5 hours after the massage I experienced nausea and thought it was because I had gotten hungry. That night I went to bed and woke about 3 am to go to the bathroom and was so dizzy I almost fell over. Since then I have had some nausea and lightheadedness/dizziness usually worse right when I waike up from a nap or at night...I had a physical one week ago and everything was great except my bilirubin was elevated. I had a baby 4 months ago that was delivered early due to pregnancy cholestasis. What do you think might be the issue here? Thanks Brandy