Whumpee with a need for control who suddenly needs an unplanned surgery--whether for an injury or a sudden medical event--and is now faced with a sudden lack of control.
They're in pain, scared, and disoriented, but the hospital/medical staff don't have time to explain things in detail before wheeling them quickly to the operating room.
Maybe they're extra confused and weak from pain meds. Maybe they're fighting too much and lightly sedated beforehand. Maybe they're just panicking a bit as the staff rapidly exchange details over their bed as they're pulled through the halls.
Regardless, whumpee is too out of it to fully grasp the situation. Before they know it, there's an IV in their arm, hands holding them down, and a mask being pressed to their face as everything fades out.
(Are they there alone? Or is caretaker already there with them, giving quiet assurances as they put whumpee under?)
When whumpee wakes up, the pain is gone (or at least different) and they're groggy and out of it, both from pain meds and the lingering anaesthetic. They struggle to remember what happened, where they are/why, etc. Maybe they panic, or maybe the drugs keep them calm.
Then the nurse/doctor comes in.
If whumpee has a trusted caretaker, the staff talk directly to them--and only them--about whumpee's discharge and care instructions. Whumpee is rarely acknowledged, and when they are it's just to check their vitals or give empty words of "comfort." Caretaker is too occupied getting all the instructions, supplies, medications, etc for whumpee's discharge to be able to explain things yet, so whumpee is left feeling vulnerable and confused even as they're wheeled out to a car and taken to a safe location to recover.
If whumpee doesn't have anyone, they may be kept in the hospital longer without explanation (if it's a higher quality hospital) OR they may be given their discharge papers, a prescription for meds, and a brief explanation that whumpee is still too out of it to understand. Whumpee is left to find their way home and figure out the post OP care on their own. Maybe they handle it well. Maybe someone finds them/steps in as caretaker at this point. Or maybe whumpee gets worse or develops complications due to being unable to care for themself and is forced to seek help.
However things happen, whumpee is forced to rely on others for at least some of their care and has to deal with the combination of major unplanned vulnerability plus lack of knowledge or anything else that could make them feel in control of the situation.