@rpec I am in similar situation. On O2 at night using concentrator in upstairs bedroom. Problem is downstairs where I would have to use a portable. Medicare helps with one stationary and one portable but not another. Carrying a portable and doing work around the house is difficult. I doubt I could do a six minute walk test without O2. I do go to BE specialist. Albuterol 7% saline, aerobica, autogenic drainage, and positional drainage. Pulmonary Rehab helped and once my back issues resolve I hope to go back.