I had severe morning sickness (and constant vomiting) from about 5 weeks until I gave birth. This is rare, but happened to me. I'm in my 2nd pregnancy now, it's going much better. Stay as hydrated as you can first and foremost, drink chocolate milk, water, tea, ice, whatever you can if you're feeling very sick. And if you find yourself excessively dehydrated because of vomiting or something, go to urgent care ASAP.
Also, if you do start vomiting, do talk to your dr about antiemetics. The over the counter stuff you can try is unison and b6 (doxylamine I believe).
Hopefully it gets better for you soon.