I Am 2 1/2 Months Pregnant With My Third Child.

I am 2 1/2 months pregnant with my third child. I have severe nausea 24/7 and I cannot eat most of the time as I have very little access to food and very little appetite when I eat. I have been vomiting a very thick bile for the past month and now it has turned into a very thick white foam. Is there anything I can do that will help me gain my appetite and alleviate some of the nausea?