Have seen dr for bilateral plantar fasciitis. 2 sets of cortisone shots/stretching/ice with little help. could sjogrens be the cause?

Yes: See a rheumatologist if you are concerned about Sjogrens or other connective tissue disease. Most cases of plantar fasciitis take along time to resolve and can be very frustrating-stretch, stretch,stretch

MRI: I suggest getting an MRI to evaluate soft tissue and internal bone in the heel. In addition physical therapy for plantar fasciitis might be beneficial.

NMS but: You will likely need orthotics to provide support to your feet. Cortisone shots and physical therapy would at most provide temporary relief. Consult an orthopedist specialist in feet or podiatrist .

Unlikely: Sjögren's syndrome in not the cause. This is typical of plantar fasciitis. You will need orthotics, ice, stretches, anti inflammatories and often several steroid shots. If this fails, sometimes temporary casting can help. Only resort to surgery as a last resort.