Chest Congestion

Have a congested chest makes running difficult. I started out today to try to run and I just could not breathe. I ended up walking, better than nothing right?, and I walked 1.33 miles in 30 minutes. I'm really starting to feel like I'm going to lose my ability to run or something taking all this time off for being sick. I'm not improving as fast as I'd like which is also making me lose my motivation. Maybe I'm just not cut out to be a runner?