morning(all day) sickness !!

I am currently 11 weeks and 3 days and my morning sickness has gone worse!! I don't vomit much maybe once or twice a week but I have severe all day nausea!! When did your nausea end? I'm currently on zofran and it's not really helping anymore like it used too.. and the strong sense of smell is even more bad! I cannot stand air fresheners and perfume !!