I am disabled myself and I have experienced this. But, I am a dual US|EU national.
I actually experienced a very traumatic injury on Thursday, and had to be seen in my city's level 1 trauma unit. I am physically disabled and fell down some steep concrete stairs, (I probably need to use a wheelchair probably from now on.)
I ended up having surgery to repair the injury on Friday.
My pain was under control in the ambulance, but that was it.
I literally screamed nonstop during Thursday, Friday, and Saturday, due to the hospital refusing to give me adequate pain control. My abdominal muscles are still sore and my voice is gone still. When pain management finally came on Monday, they cared more about what medications I could "get outside" the hospital and "what the maximum quantity would be" more than actually controlling my pain.
They didn't even have any pillows for me on the unit to elevate my limb.
The whole experience was extremely traumatic and barbaric. It was reminiscent of a third world country.
Supposedly this is one of the best trauma units in the country, too.
I am done with this country. I cannot do this anymore. It is killing me.