A Break from Running

How many days off from running makes you a non-runner?
I had a 5k race on Feb. 12th. I woke up late and had to rush to the starting line. I didn't really think about the little sore spot in my throat.
I tried to go at a slower starting pace then I usually run (like everyone else I almost sprint off the line). It seemed to pay off, thought tired, I was able to kick past 2 runners in the last tenth. I finished with a PR (only 1 sec. faster, but Hey).
Later that day, the cold hit. Very sore throat, stuffy head, slight fever, achy. I moped around the rest of the weekend and went out for a light run on Monday- trying to burn it off. It didn't work.
Now it's a week and a day later and I still have this cold. Today the cold left my chest, so it's now all in my head. It would have been easy to stay inside another day, but it's already been a week without running. So the shoes go on and the handkerchief in tow- a light 3 miler.
I'm back, still sick, but still a runner.

Shoes

By luck, my first pair of shoes were a good match for me. They are a pair of Nike Vomero 4s. I bought them at a store in the mall that specializes in more dress shoes and they just happened to have this pair, on sale, and in my size. They felt good, so I bought them. I just have about run them out. They have about 520 miles on them so I should probably call it quits soon. I already have a replacement pair of Saucony Progrid Ride 3s. I bought them in December when I was visiting family- there's an actual running store there!
I have them in the box and haven't taken them out yet.
A couple of days ago I decided that i needed a pair of trail shoes, so I bought some New Balance 621's. I figured that I should give them a run. It turned out to be a 10 miler where about 2-3 miles were on a snow-shoe track (about a foot or so of snow). At about the 8.5 mile mark I realized that these shoes don't have the arch support that the Nike's do. I had to modify my gate the last mile and a half so that I wouldn't put too much pressure on my arch. Hobbled home and averaged about an 11'20 mile- but it was tough!
today I went back to the shoe store and picked up a pair of insoles. I'll give them a try later today.
i wish that running shoes came with a coupon for a pair of insoles, so that when you bought a pair, you'd match them with the insole of your choice. I'd rather pay $130 for a pair of shoes that are good to go, then to pay $90-$100 and then buy insoles- just the idea of it.
Well, however it is, I'm going to make sure that my shoes are not the cause of an injury.