My dad's been diagnosed with stage 3 COPD. His breathing rate is 84 and his SpO2 is a bit above 90. He's feeling extremely weak and he's down to only 40 kg. The doctor did a CT scan and confirmed it's TB. I'm really worried about his condition and what the next steps should be. What kind of treatment can help him, and is there anything specific I should be doing to support his recovery?