12+3 and Morning Sickness Returns ?!

Stephanie
Last week I had a reprieve from throwing up every night and yesterday it came back ! 
Every time I try to eat a salad or fruit I am compelled to throw it up. Is this normal?! 
I have to eat carbs every two hours or else I get sick.  
Why did it come back as I approach my 2nd trimester ? Any advice ??