I climb ~425 feet in 9 miles on the way home, but I have experimented with a less safe route that is 7 miles. It was a tough slog as the average incline was steeper. If this is something recent You may have a virus. Also, you may want to look at your sugar and carb intake. I find coffee effective to help me get going in the morning, but also I will listen to podcasts; and I find listening to news and political podcasts from sources I disagree with is almost as effective as coffee for keeping my system revved. I also think I do myself a favor by listening to opinions I disagree with. It challenges me to constantly re-evaluate my own opinions, often strengthening them. If you feel fatigued for more than a month, see a doctor.