Revrick

I am a 67 year old male, and 3 times now I have come down with flu like symptoms after a strenuous activity. The first time was about 10 years ago when I went kayaking down a river that was very difficult. At the end I was exhausted. On the way back in my vehicle I started getting sick. It lasted like 3 days before I was back to normal. I started working on my firewood a few days ago. I was tired, but not too bad. I did it again the next day. That evening I started getting nausea, headache, and body aches, like I had a real bad flu. It lasted a good 36 hours, but I think I am ok now.