This is actually my first time posting ever (sorry if I'm doing it wrong), but I really wanted to give you some support.
Our last trip to Disney we were 4 days fresh out of the hospital with our 4 year old. He has, among a bajillion other things, epilepsy, hydrocephalus, asthma, at the time hypoglycemia, and he was still recovering.
We were lucky to stay at Wilderness Lodge, because we only got 2 hours out of him at a time. That's 2 hours from leaving the resort (counting travel time) to where he starting breaking down. And he took at least another 2 hours in a dark, cool resort room before we could even think of going out again, not to mention that sleep was totally off.
We used the First Aid Stations a LOT - we were there every time we entered a park to drop off meds, whenever we needed somewhere quiet and cool with wayy less stimulation, or to give meds or check hydration.
We used a GAC plus a FastPass for pretty much every ride we did - and we only did 1-2 rides in a day. Anything past that was cake.
We spent a lot of time in table service meals, because it was air-conditioned and a great way for my son to see characters and have fun, and eat a bit more because he had a couple of hours to do it in. It also gave him some higher tolerance for the heat in the park afterwards.
Finally, we just had to accept that this is how we do Disney. Go to the park, do a character meal, do one ride with a FastPass and GAC, maybe a second if we're really lucky, then head back to the resort for a 2-3 hour rest time in a dark room. Then do it again in the evening. We'd also switch off, so one parent stayed for the daytime rest break while the other went out, and then we switched at night, so the daytime rest parent go to go out at night.
Did we get a lot done? No. Did we have the Meltdown of Meltdowns in Epcot? Yes. Was a good trip? Well, he didn't end up in the ER with more seizures, so yes.
*hugs* but those trips when it really gets shoved in your face that no, being at Disney does not make everything better? They suck. They really suck.
*hugs and sympathy*