Just came in from running 25 minutes on Week 7! Wow can't believe I've got this far. I found on my run my breathing was steady, my legs didn't ache however my sinuses were blocked. This gave me a huge headache and took the fun out of my run Today I decided to take my anit-histamines and nasal spray before hand. The headache lessened but I still had blocked sinuses that make breathing properly harder. Does anyone else suffer from this?