This information might be helpful.

Piriformis Syndrome and/or Piriformis myofascial trigger points is a common cause of chronic lower back, hip and leg pain in patients who have compensatory gait disturbances due to neurological and orthopedic disorders. These two causes of hip & leg pain are often missed during diagnostics for pain in these areas, so it is worth asking about this potential from attending physicians.

Physiotherapy, chiropractic or massage therapy may be helpful in relieving the cause of pain due to these conditions; and Piriformis Syndrome and/or Piriformis myofascial trigger points should specifically be mentioned to the practioners of these health sciences as a possible cause of sciatic distribution/calf pain when seeking their care.

Typically pain from these two conditions is felt in the sacro-iliac and buttock, but it may also radiate pain in a sciatic nerve distribution down the back of the leg; leading to calf/foot pain and cramping. This seems to be especially true in long standing cases.

If you Google search "Piriformis syndrome" and/or "Piriformis trigger points" there is plenty of information available; including self care, in the form of specific stretching exercises and direct pressure techniques.

Hope that you get relief soon.
Erika