I have difficulty in walking and difficulty stairing stairs without pain coming down is not problem getting up from low chair is also big problem what?

Back problems: Your complaints could be coming from your low back, although you don't mention where the pain is. Arthritis in the spine is very common. That could have caused a bulging disc between 2 vertebrae, which is now pushing on the nerves. Sometimes physical therapy can help. Strengthening your core abdominal muscles helps. See your doc to get a referral to physical therapy.