thank you sooooo much for the reply
I'm so sorry to hear of this. First off, I wanted to say that pain during an HSG is very typical. It was also explained to me that the difference between an extremely painful one and only a minorly painful one can be due to the difference in the cathetar used and if it is flexible or not. That could've been a variable among a number of other things.Unfortunately, beyond that, I won't be much help to you as I have never heard of a shrinking uterus myself, but I did want to say I've had a heck of an uphill battle with MANY doctors (I'm on my 4th OBGYN in a year and half!) - and there are many out there who may seem confident, and some who are great and very sweet, but they don't always know what they are talking about. My first doctor swore up and down I did not have PCOS or endometriosis. The second doc properly diagnosed the PCOS and ignored my insistance that I thought I had endometriosis due to my pain and the fact that my mother and sister have it. He refused to entertain the idea and I consequently went through 7 months of unsuccessful fertility treatments that were bound to never work because of the endometriosis he refused to look for. Then I switched docs again and the third one immediately did surgery to look for (and ended up finding and removing) endometriosis. My very first fertility treatment after surgery I got pregnant (it didn't stick but that's another story). I left her for other reasons and went on to the fourth doc... The point being - what these doctors say is not set in stone, and sometimes you have to fight to find one that will understand and listen.
If you are disheartened and uncomfortable with the diagnosis, I would first recommend that you ABSOLUTELY get a second opinion.
Best of luck to you!