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Take your mother to a doctor or Ayurvedic practitioner, before starting any new medication or supplement like Sandhi Mitra Vati. This is particularly crucial for patients with pre existing conditions, like diabetes, and considering potential interactions or contraindications. 

Degenerative disc disease is a common age related low back problem. It can be a significant cause of low back pain. The best treatment for it is non-operative. Back strengthening to stabilize the spine and application of topical pain measures should be tried first.

Pain in the foot joints after walking a lot is quite common. The joints might be sore from the pressure and movement. To ease the pain, rest your foot, apply ice, and gently stretch your foot and calf muscles. Make sure to wear comfortable shoes and avoid walking long distances for now.

Now, your brother can begin with light exercises such as walking and stationary cycling. He should refrain from high-impact activities such as running, jumping or twisting until he finishes his rehabilitation program. It would be wise to ask his orthopedic surgeon or a physical therapist for more information on the recovery process and advice about activities that he can engage in without risk.

An outward roll of the ankle may cause immediate pain and swelling, so an eversion injury is likely. There could be mild fractures or other problems missed by the initial examination or X-rays. I would advise you to get it checked again, if not much progress has been made in the next 3 weeks even while using an air cast for support.

Alcohol is supposed to be predisposing factor for gout. But it's not scientific proven that gout will only flare if you quit the alcohol.