All day sickness

I’m a little over 9 weeks and the morning/all day sickness seems to be getting worse. I’ve been taking 25 mg unisom/b6 at bedtime per my doctors instructions but it only seems to be holding out till lunch time or so. Is this pretty normal? I was concerned I’d lost a lot of weight because I’ve been hardly able to keep anything down but I’m only down a couple of pounds.