not being able to keep anything down

i am 12 weeks and 5 days and ever since i found out i was pregnant i haven't been able to eat or drink anything, not even water or crackers. everything is coming up 5 minutes or even sooner. i am so weak and now weigh less then i did before i got pregnant. i also am to weak to hold my 2 1/2 and 1 year old. i don't know what to do my ob has switched my meds 3 times and nothing seams to be working, she just keeps telling me "wait till 13 weeks and it should all go away" but ill be 13 weeks in 2 days and i don't see that happening. what should i do? 😭