I understand your concern. Since the current combination of betahistine, calcium supplements, and standard pain relievers is not providing relief, a medical re-evaluation is the best next step. For her vertigo, I recommend consulting an ENT specialist or neurologist to discuss vestibular rehabilitation therapy or alternative vestibular suppressants. For her intense foot pain, the issue may be nerve-related rather than muscular. A neurologist or orthopedist can evaluate this, perhaps by checking her blood sugar and nerve conduction, and may consider nerve-specific medications like pregabalin or gabapentin. Please consult her doctor before making any changes to her treatment.