Feeling As If Shrinking?

I am not sure if this is a hallucination or not, and am NOT looking for a Diagnosis or anything but was just wondering if anyone else has ever had the sensation of feeling yourself physically shrink? Sometimes, usually when I am having sex or masturbating, and before I fall a sleep, and sometimes when I am walking down the street, I get this overwhelming sensation that I am shrinking and that I have become such a tiny person. At times, I also get the opposite. The only time I feel "larger"... Feeling As If Shrinking?
https://www.myptsd.com/c/threads/feeling-as-if-shrinking.11050/