@bbk186
Just to confirm, did you have a MRI of your lumbar spine and pelvis/hips to check for compressed spinal cord/nerve roots/nerves/claudication/degeneration or soft tissue injury/damage?

Did your neurologist do a small fiber neuropathy skin punch biopsy taking samples of tissue from upper thigh and calf/ankle? Your symptoms sound similar. The restricted blood flow during a long flight and/or inflammation/fluid retention may have triggered and irritated your small fibers in your calves and feet.

Do you drink alcohol, smoke/vape, are you diabetic, were you tested for vitamin/mineral deficiencies/toxicities, etc. which are tied to small fiber neuropathy?