Question regarding anal depth play.

So I have had issues every so often but personally I can take quite the depth on a good day. My question is, why is it that on some days I simply cannot get around the bend at the 17-18 inch mark. I try lots of lube, different angles, thrusting to loosen it but around that area in my gut just feels tight. (this last happened on a day that I experienced nausea)

I do have angioedema so I get swollen intestines but would that prevent a toy going around the bend or have I perhaps overstretched and it's gettign caught on a pocket? I'm losing my mind here, I just want to get back to depth play. I can get the slink in no problem but nothing wider. It's almost like that part of my bowel has shrunken to the size of a cervix.

Please any advice would be great.
 
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