Night sickness

Hey ladies, I was wondering if anybody else was experiencing what I'm experiencing. For almost 3 months now I've been throwing up every night before I go to bed. It's as if I'm not digesting my food. I'm 28 weeks pregnant now and I'm still in the same situation. I lost 3 pounds the last time I went to my doctors visit. The doctor said it was okay but I'm honestly worried. Is this normal? Has anybody else been experiencing this? I barely eat :(