I would consider a neurology evaluation at this point. The cardiology and vascular surgery evaluation would rule out many vascular issues.
An MRI of the spine can look for any disk herniation which may lead to nerve impingement, and nerve conduction studies can look for neuropathies.
Blood tests to evaluate the vitamin B-12 level, calcium level, thyroid function and liver function should all be considered.
If the symptoms continue, more invasive testing like a muscle biopsy, can be considered.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
kevinmd_