Headaches and energy loss

After going a couple of years with COPD, I recently went through a phase where I was more debilitated than usual and struggled to do much of anything without stopping to catch my breath. I also developed this nagging headache, which seems to almost always be there now. I have noticed that my condition significantly improves if I am able to expel phlegm.....I take Anoro but that's it. I don't take Mucinol or anything for headache. Does anyone else have good days and bad days like this?