Hello, I have been coughing up a lot of phlegm for the past 2 months and feel v fatigued especially by early evening. Had recurring chest problems since 2012 but this is the worst it has been. Previously cycled to work and done Parkrun and sprint triathlons but all of this feels beyond me at the moment. However tomorrow I'm supposed to do a 10k charity run which I signed up for last year. Should I do it? I am very distressed by all of this. I just want to get better.