What Causes Burning Sensation In Legs While Suffering From Sciatica And Cervical Spondylitis?

this is not for me. My sibling a physician was diagnosed with PD. Has severe sciatica, bulging disc (L4,L5, S1 & S2) cervical spondylitis, burning in her toes (third and fourth toes), lateral side of the feet and it runs up back of the legs, usually one leg more than the other.On neupro, 8mgm patch currently and carbi/levodopa 25/100. She has none of any symptoms of Parkinsons what so ever, no dyskinesia, nor dystonia or tremors. She is up and about for 2 hours after a 1/2 tab of the carbi/levodopa. After 2 hours has complete draining of her energy, legs heavy and cannot walk.Normal times walks upright, ramrod straight, and is fine. Does this sound like a misdiagnosis and wrong treatment?