I need to use the Companion Restooms when I am with my daughter who uses a wheelchair, needs me to lift her in and out of her wheelchair (so some of he other handicapped stalls are too small for me to do this safely). She also has other issues that make the Companion Restroom important for us.
My attitude is that, on boards like this, I ask that people are using the Companion Restroom out of choice realize that some people have no choice and need[i/] to use that restroom. Some people may have a visible need, but some (like yours) may be largely invisible.
There is no way to tell when someone is coming out whether they actually used that restroom because they needed to use it or because they chose to use it, so I would never try to judge or say anything. It is what it is.
I hold the door for them as they come out, if they need it and many hold the door for us. Some of the parents with children feel guilty when they see Someone ith a wheelchair waiting because they did not realize.
Even though my DD has a visible need to use Companion Restrooms, we have gotten flack from using them. Sometimes from people outside the room who are waiting who have pounded on the door, asking what was taking so long. Sometimes as we come out, the person waiting will make a comment.
Almost all the comments have been from people with children in strollers - and many have been unkind- "you have handicapped stalls in the restroom. You people need to use those."
So, you may hear some comments - not often, but not nice. You just have to remember that you know what you need and the people making comments have no clue or regard for your feelings.
In your case, with your husband outside of the room, handing you things, I don't think you would get anyone questioning -or- if they do, your husband will be outside of the door to defuse things.
If you want to use a private restroom where no one will make any comments, i would not go to Baby Care - since you have no child with you, thy would most likely not allow you into their restroom, would not want your husband stnding outside the door and, because you are going over Christmas, it will be very busy in ALL restrooms.
Especially at MK, we usually have to wait in line for the Companion Restrooms. Since that park is visited more by people ith children, there is more competition for use of those restrooms.
First Aid may not be convenient, but you can use the private restroom at First Aid in any park. You do need to check in with the nurse at the front desk, just so they know who is inside First Aid and why. But, you don't need to go into detail - just let them know that you need to use their restroom for a medical need - that should be enough.
Also, if you don't actually need your husband nearby, just need a sink in the handicapped stall, you will find handicapped stalls like that in ladies rooms at AK and the Studio pretty universally. MK and Epcot have been renovating/adding handicapped stalls with sinks, but it's kind of hit and miss.