Help sever all day sickness

Ok so I am 5wks and 6 days per Glow. My nausea has prevented me from keeping even the most blandest foods down such as saltines, oatmeal, water, salad and I can't keep it down or go on after eating it without being sick. In the past when I felt sick from food poisoning I smoked marijuana and it helped. I researched after researched and I cannot find a clear cut answer if it will harm the baby. I called my dr and his triage nurse flat out shut it down and said we don't recommend it didn't give me a reason why or anything and advised me to take unisom and vitamin B which I've read can have side affects against the baby. Why is man made medication ok but not natural herbal medicine?  I do not and have never liked taking pills I don't even take Advil. Marrijuana has always been my medicine in a sense. I just want to bE able to keep something down and not throw up. And I know this is apart of the process but damnit this is my 3rd and I've never experienced sickness like this.  I felt like what she said was biased. Has anyone ever experienced this?