You are describing something that used to happen to me. You may want to go to the doctor. I ended up being borderline hypo-glycemic. I have to eat before I train or it is a huge disaster.
Now, I eat just a little something, maybe some toast with peanut butter and honey and have some coffee and h20. I’m fine then, but I make sure to eat immediately following the workout also.
Bonking doesn’t really feel like low blood sugar. When you bonk you just feel spent, like you can’t go any further. Low blood sugar makes you feel rummy; almost like you’ve had a few*.
Depends on the person. When my BG goes low I can pass through the slightly drunk stage into the completely spent stage in a couple of minutes.