Hello,
I can understand your concern about your symptoms.
1) Marijuana would not help to reduce your symptoms, in fact it may aggravate episodes of vomiting.
2) Your symptoms are suggestive of
gastroenteritis which is inflammation (redness + edema) of stomach and start part of
small intestine. This develop due to irritation or allergy from particular food, partially cooked food or uncooked raw food.
3) Antibiotic medication, anti-spasmodic medication (for pain), medicine to prevent vomiting and anti-acidity medicines are mainstay part of treatment for gastroenteritis.
4) repeated episodes of vomiting and
diarrhea might cause development of
dehydration which require hospitalization for IV
fluid therapy in case you would not able to drink/eat enough due to symptoms.
Hope I answered your query. If you have any further doubts, I would be happy to help you.
Have a nice day!