I've had 3 pregnancies all with TERRIBLE "morning sickness", even spent 3 days in the hospital. Phenergan was the biggest help. Cinnamon gum helped alot during my last pregnancy. I've been told that some doctors will do a blood test and find out what vitamins & minerals your body is deficient in and give you an IV containing the needed nutrients. A couple of women with severe morning sickness have sworn by this. If I'm blessed with #4 I am definitly going to try this.
I suggest you call your doctor or midwife regarding the fever.