Smoke Inhalation

Looks like inhaling smoke on the way out the door really wasn't so healthy. I feel like I did right after I quit smoking. I feel like my lungs are clearing out the tar and other chemicals. The difference is that a) I was running down the stairs so I was breathing deeper and b) it was more concentrated. I won't go into details but I've felt somewhat sick since then. Today I almost called in sick to work except I was scared to miss a day... and get further behind on my work. Now I'm fighting a headache on top of everything else. When will it end?