betagirl, i have crohn's too. i have a fairly mild case, but i understand the feeling of struggling with your own body and being so frustrated you want to scream.

we often change our diet because of crohn's and if you're missing certain foods, or eating at different times, or not digesting everything (ie not absorbing all nutrients because of the part of the intestine that is affected by crohn's) that could contribute to bonking.

i'm going to suggest things even though you're probably already doing them-- better to suggest it than possibly avoid the root of the problem! if you're not eating certain foods because of how it affects you (i know the feeling ), take a look at your overall food consumption and make sure you're still getting a balanced diet and not missing out on carbs or protein or nutrients. also, check out when you're eating:if you eat at certain times to avoid getting symptom at certain times, maybe you could find things to eat pre-ride that will give you energy but won't cause symptoms, if that's a concern.

also, depending on where and how much the crohn's is affecting your intestine, you may not be absorbing all the nutrients you're eating. it may be worth asking your doctor if this is a possibility. also, check out your iron levels, because as women with crohn's we are particularly susceptible to low iron, which can have a drastic affect on our overall energy.

like i said, you're probably aware of these already: i'm kinda worried i have a preachy tone, and i don't wanna sound like i'm doing a mommy thing. but i've been there, i sympathize, and i want to mention all the possibilities just in case. it does sound like the solution could be a pacing thing, but if crohn's is on your mind it doesn't hurt to consider it. hope this helps.