I would guess that it has to do with horomonal changes. If you still have your ovaries you still have the horomonal fluctuations that would cause a period if you had a uterus. During my cycle I get tight and often times can't eat. I will take a bit and know that I just as well stop there, wait for it to come out and then drink a Protein shake because that is all that will go down. Try talking to a GYN about this. My OB/GYN is very familiar with band life and has studied it in order to better help his band patients.
I am on my cycle now and last night I couldn't eat. Took one bit and I knew it wasn't going down. The PB'ing started and I opted for a shake instead. Sometimes that doesn't even want to go so I end up with coffee the hot liquid seems to help open me up where Fluid and food go down better.
