What is it about the stretching room that you have trouble with? Is it being squished in an enclosed space with people closely surrounding you? If this is the case, be aware that may happen just beyond the stretching room, as well, in the hallway. If you have issue with enclosed spaces, be aware that there are other queues with similar enclosed spaces/rooms you have to stand in to listen/watch a story. Guardians, Webslingers, Rise of the Resistance are the three others I can think of off the top of my head but I think there are a couple more. My daughter has issues with anxiety in these kinds of spaces and we use the
DAS pass to avoid them. If this is your issue, you may want to look into getting a DAS to avoid them. It’s been a couple of years since we’ve had to do it (our daughter has since overcome her anxiety of the HM and GoG rooms) but for Haunted Mansion, since we enter through the Lightening Lane, we told the CM at the entrance we would need to skip the stretching room. We were usually taken through the wheelchair entrance when we get to the porch.