There is no harm in warm water therapy. You can easily continue this for whole life and you would not have any side effect but this does not going to cure the disease and it will provide only symptomatic relief. I would suggest you to get your spine MRI
to see if there is any nerve
compression which is causing calf and shin pain or it may be due to lack of serum calcium and B 12 . so get these tests done and get its treatment as well.