What happened to me??

So, I'll be 14 weeks tomorrow with my 3rd pregnancy. Last night, i woke up and vomited for 2 hours with barely a pause between. I ended up passing out and my brother took me to the ER. Once there, i began to break out in a rash and shake uncontrollably. The rash literally looked like my skin was turning red, but it was unbearably itchy.

They eventually gave me IV fluids, a shot for my nausea, and a shot for the rash. But they just said it was caused by morning sickness and sent me home. Does that sound right? Is this a normal occurrence for morning sickness?