Fear of Prolonged Constraint or Discomfort?

Is there a named phobia for a fear of prolonged constraint or discomfort? I originally thought I had claustrophobia but I don't think that's it - I don't have any issues in elevators or other small places, as long as my arms and legs have a reasonable degree of freedom.

Where I have problems is when my arms or legs are constrained - for example, in the back of a small car on a long drive, if I can't extend my legs beyond about 45 degrees, I start to panic. Similarly, I often panic when getting dental work - not from fear of the dental work itself, but if they need to use the clamp that holds my mouth open and prevents me from swallowing, I start to panic. I sometimes even panic when I'm wearing rigid ski boots that prevent me from flexing my ankle, though that's less of an issue since knowing that I can take them off whenever I want is calming. Knowing that the discomfort will be for a long duration, or not knowing the duration at all, makes it worse.

I suspect these are all related and have a shared root cause - is there a name for it? Bonus points for recommendations for effective anxiety relief techniques or solutions.