What Does Sudden Dizziness Mean?

Hello Doctor, A couple of nights ago I went to bed and was uncomfortable..having plenty of pillows and a foam mattress..as I turned onto my right side my head felt all light and and dizziness to it..I was afraid to get up to the toilet..but after a while I got out of bed very slowly..and felt ok..nothing has happened again..until this morring i am sitting down at the computer..it feels slightly wired again..is there any thing I can eat or do to help get rid of this feeling..