I had an acute asthma attack, administered oxygen, morphine, and 3 other meds, enlarged heart. should i take oxygen?

No: O2 should be prescribed by a pulmonary physician after finding that your o2 levels are low. Low o2 mean severe pulmonary or heart disease. Reason should be investigated. You need to stop smoking asap. It is not helping and is worsening your condition. I suspect you may have a combination of chronic lung disease/ reactive airway/ heart condition. Consult an internist/lung specialist soon.

Testing: I would suggest a workup to identify the cause of your enlarged heart. Sometimes a heart condition is associated with fluid in the airway wall which constricts the airway. This can result in wheezing and contribute to your asthma symptoms. Some diagnostic tests to consider include a cardiac echo 6 minute walk test with pulse oximetry. Pulmonary testing with and without albuterol ,