Day 54 - A run outside

I have been having a headache for some days now - started on friday. It's a dull ache, 3-4 on a scale of 10. I am thinking it may be because my eyesight is going bad. It is there when I go to sleep, it is there when I wake up in the morning, and right now the bright screen of the monitor is kinda hurting my eyes, hence the bad eyesight thought. It got bad on saturday and I had to take ibuprofen.
Today, I thought some fresh air would help and decided to go for a run outside. By the end of the run, even though my legs, ankles, feet were ok, every step I took felt as if a ball was bouncing in my head, so had to walk the last mile instead of run.
Again, I think running outside is much difficult than running on a treadmill. I was getting very accustomed and comfortable with running 3-4 miles on a treadmill, but today's run was different. Even though the aches were much less than that on a treadmill, I was out of breath much more earlier, one excuse can be that it was cold outside :)
While walking back, I had some thoughts as to whether I really wanted to run the marathon, was I really interested in the training....no answer. Though after I reached home, I had thoughts about how I would repeat the same run again till I was comfortable and I could do it in a much lesser time, also, how could I add distance at weekends etc....
But if I have to run the actual marathon outside, I definitely have to train outside.