You definitely need to talk with a lung specialist about your pulmonary function tests (PFTs) results. The DLCO is just below the lower limit of the normal range. The findings show air trapping. However there is no sign of airflow obstruction, as would be seen with COPD due to AAT deficiency. The blood oxygen change you describe suggests the persistence of lower lobe atelectasis.
Most importantly, given this possibility, these PFTs results should not be interpreted as indicative of any lung disease. They should be repeated at a later date when your lung function is deemed to have stabilized.