Hi,
Welcome to the ehealthforum and I am really glad to help you out. Your concern is regarding the stiffness in feet that you are having.
With such symptoms, rheumatoid arthritis should be ruled out. It may cause stiffness and pain with movement. Over time, deformity of the fingers may occur.Diagnosed by ESR and Rheumatoid factor in blood and x-rays of digits.
Worsening of hypothyroidism can also cause such symptoms. Hence i suggest you to get your recent thyroid profile done. also consult a rheumatologist to rule out any rheumatoid arthritis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.