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Have you seen a doctor about this situation?
What are you doing to address the compressed nerve?
Sounds like you have some work to do to improve the ankle rom.
You may need to work with your hip as well.
Free Your Heel, Free Your Mind
Ankle Positional Fault Fix: Jill Miller Style
Squat Quick Test: Is it your Ankles or Hips?
There are several other ankle/hip mobs.
Having a difference side to side can cause an issue. The differences need attention so there is not a difference side to side.
Episode 352: Dealing With Old Junky Tissue
You need to start working with the area. I would recommend starting with a softer ball than the lacrosse ball.
The Yoga Tune Up balls are a great option Therapy Ball or Therapy Plus Ball are good options.