Hi,I'm 22 Weeks Pregnant. I Found Out About A Month

Hi,I'm 22 weeks pregnant. I found out about a month ago and I've been smoking marijuana to take my sickness that I have periodically through the day. I get weak . very dehydrated to the point I have to keep going back to the hospital to get a iv my obgyn prescribed me nausea pills so many times from pills to dissolve pills and never worked. But when I use marijuana in the morning I'm good half way through the day. Then when I don't use it. I keep persistently throwing up. What should I do because I don't wanna lose NY precious gift but it helps me with my mood swings my stress and my apatite. Please help me with this answer before I'm to late :(