I've heard of occasional insulin resistance, but does your body ever have carbohydrate resistance?

I'm a T1. I have had constant stomach issues for the past few years, so this may be more related to that, but I want to see if this affects any other diabetics. Lately, I've been having more nausea than normal, which makes my diabetes harder to control. There are times where my body takes a long time to absorb carbohydrates to send my sugar up. Like I'll eat something relatively fast acting and my body will lag. But sure enough, 1-3 hours later, my sugar will rise. This is usually when I feel nauseous or fatigued. It feels like my body can't absorb the carbs as well or something or it's a delayed absorption.

It is NOT due to large amounts of active insulin or anything like that. I've been frustrated going to GI doctors in the past because they all say it's a diabetes thing, but I can honestly say, having this disease for years and years, it's not extra insulin in my body that's causing this (like high amounts of active insulin).

It makes my diabetes even harder to control because if I'm low, it makes it a challenge to bring up sugars and wait nervously. As a result, I try to keep myself higher, which isn't a good strategy, especially with Covid-19 going around.

I've also had two instances in the past year where I've thrown up food randomly and had to wait outside the ER because I was low and I couldn't keep food down. Luckily never had to go inside and get a giant bill, but we sat outside waiting if my sugar went below 50.

Does anyone also face this problem occasionally?