This has happened to me.  I had to go to the hospital for fluids. You have no other choice.

It can be hard to decide when you're getting dehydrated enough to warrant an ER visit. If you're delaying, pay attention to your peeing - if it gets very dark or stops you have a serious issue. In the meantime, you can try sips of Pedialyte or other Oral Rehydration Solution.

Thank you guys. In the ER now getting IV fluids. Had hoped to avoid it though

I'm pleased, you've sought assistance from the Hospital.

When you say " you can't even keep water in " were you vomiting ?

I feel you may have dehydrated; now you're in Hospital, you probably already know that.

Whilst I was awaiting my takedown surgery, I was unable to absorb sufficient fluids despite how much I was drinking; this occurred often and each occasion resulting in an emergency admission into Hospital by Ambulance for IV fluids.

It's true to monitor the colour of urine output and to urinate no less than 3 times per day.

My urine was clear; at the time I had a loop ileostomy and my colostomy bag was filling quite rapidly, also with a clear liquid; it was initially thought, I'd overhydated.

As well as randomly falling asleep, I started to vomit all I'd drank earlier, think by now, I'd lost my appetite too.