What do I do?

  I don't even know what to do ... 
I'm so light headed and dizzy not eating much because constantly feeling pukey 
Should I be worried? 
When should I be concerned? 
Have only scene my family doctor and not seeing her again till mid August 
This is my third never had this issue before is baby getting enough If I'm taking a prenatal and barely eating?
My friend told me it's morning sickness but I haven't been sick! (Just constantly feel like I'm going to)
 Due March 5th (8wk +2)