I’m very impressed to hear that you’re 81 years young, I had a lobectomy at age 69 and I couldn’t do half of the work that you did and so soon after your surgery. I commend you on your dedication to recovery but I think you might be pushing yourself a bit too much, I understand what you’re trying to do however it seems that you’re aware of that, getting pneumonia has nothing to do with your surgery but rather exposure to the environment, a mask might have helped you, also, your body needs to adjust and get stronger in time, perhaps a slower pace for now and then you can gradually increase the activities. It’s a lot to deal with after a lobectomy and a lot has been done, your immune system needs to get stronger too. I’m glad that you’re doing better and you can catch up with your doctor soon and hear what they think, best wishes for your recovery.