Hi New,
At just 4 weeks, your body is still trying to figure out what the hell just happened, so I'll tread lightly. By switching to a liquid diet, you're probably doing the worst possible thing. Well, OK, to be fully truthful here... if you still have your terminal ileum, your small bowel can absorb a little water, but not much. And if it's gone... you're an open fire hose. You have to realize that as an ileostomate, you can no longer hydrate (i.e., absorb liquids) the way normal people with a colon can. That's because the colon is what absorbs all the liquid you drink to keep you hydrated, and yours is probably in a medical waste dumpster if it hasn't been incinerated to ash by now. And without one, almost all of what you drink (with the exception I'll get to in a second) just ends up right in your bag. What's worse is that when you drink something too sweet or salty, your small bowel will pull water from your body to try to dilute it to a ratio it can deal with... which just dehydrates you even faster. That's probably why you're nauseous.
So the first thing is to address motility. As mentioned, things like Immodium, Loperamide, Diphenoxylate, etc., can slow your shit down... literally. The other way is to eat fats. Fats cause the stomach to hold onto its contents the longest and release them slowly into the small bowel. Carbs are incredibly bad for everyone, as they cause spikes in blood glucose, which causes inflammation... but that's a story for another day. Next is to find yourself some Oral Rehydration Solution (ORS) or make your own... it's very easy. Essentially, it's any liquid that's in the proper ratio of sodium to glucose to water so that your small bowel will recognize it as something it can absorb, since the small bowel focuses on glucose and sodium absorption. When those two things are at the correct ratio, the water gets a free ride on the back of the sodium and glucose molecules into your small bowel, and you get hydrated. Ain't that the shit?? But if the ratio is wrong... well... we already covered that. I've talked about ORS on here a million times, so do a quick search or Google it, and you'll have more info than you'll need on it. Just remember you can make it out of practically anything, as long as the ratio of sugar (glucose) and sodium (salt) is correct for the amount of water you're mixing it with. And once you get the hang of it... it's easy peasy.
Try those two things, and you should be feeling better pretty quickly. If not, you'll probably have to upgrade to Premium membership to get the 'good' advice that actually works.
Just kidding!!!!
Let us know how you make out!!
;O)