Dehydration help!

So after having very minimal vomiting and mostly nausea for the whole first trimester. Today at 13w 5 d I was so ill that even water was making me vomit. All day. I got a serious headache, dark dark pee (hardly any) and my ass cheeks/lower back and legs became so so painful to sit, lay, walk.

So I went to the ER have nausea meds but I’m still not keeping water down. Bed rest for 48 hours.

Just ran to buy some bananas, crackers and bland noodles but what else can help?!?