My husband has chronic COPD for the past four years+ numerous trips to hospital, on O2 24-7 at home and many meds. Question is now he has dramatic instant drops in O2 levels with no explanation. Just sitting in his lounger, not doing anything and O2 drops from his average of 88-90 down to 70 and then panic attacks hit. He is not too mobile, difficult to walk as he begins gasping He does have congestive heart failure along with COPD and doctors have not been too helpful other then prescribing steroids and antibiotics Ideas?