I had a bad run recently. We all do. This particular one was a planned ~14 km. It was going to be a one-way run, my partner dropped me off on his way to the movies. Unfortunately after I got started I realized I had to make major detours to get around busy roads. So it turned into a run-walk, mostly walk with me looking at maps on my phone. After about 10k of this starting and stopping, I gave up running as I was feeling twingy in the knees and hips and walked the other 5 k home. Not what I was hoping for, and it felt like a waste of a long-run day.
So how do you follow that up? With a guaranteed success. Again, I had my partner drop me off as he was going to the gym and grocery shopping. This time I picked a nice 5k one-way route. ENTIRELY flat or downhill on the way to my house. Had a lovely run-walk back to my place. Ran the fast bits fast, and walked whenever I felt like it. Finished with a fantastic sprint finish once I had a nice straightaway. Didn't quite hit 5k and didn't care. The point was to go have a good time running and feel good about myself. Mission accomplished. So if life hands you a rotten run, follow it up with the sort of easy run that makes you happy. Long and slow? Short and fast? Whatever gets you back in a positive running space and reminds you of how far you've come.
The antidote for a bad run is more running. Sounds crazy doesn't it?