This is a great question and ALL of us deal with setbacks and challenges at some point.
First and foremost, we need to listen to our bodies. A little discomfort is one thing, but pain is something else. The goal we're trying to achieve is to be healthy, right?
Does walking help as opposed to running? Can you walk instead when it's cold? What about an indoor track or a shopping mall near you? Do you have access to a treadmill?
If not, you may need to put the walk/run on "pause" and do some other indoor activities--DVDs or other things you have at home--and start up again when the weather and your asthma get better.
Good luck and let us know how you're doing!
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