Running for fun?

I started running again yesterday. I had stopped for about two weeks because I had been sick with a horrible stomach flu that has been raping our Station. As soon as you get over it, (it lasts a couple days), you feel weak and horrible, then you catch it again at work and the cycle continues. I have sterilized the be-gee bees out of the station but I think it's the male head, (bathroom), where the virus multiplies. I REFUSE to touch that place, so I guess the Station will just keep feeding the cycle. There are fewer and fewer cases now, so that is good...
So my run SUCKED MAJORLY!!! I am saddened by how hard and painful 2 miles has become. I worked so hard to get past that feeling and it is disheartening to have to go through it again. I had to stop at two miles and walk and even then I was still having trouble. So I got on the elliptical for 20 minuets and took it easy. I'm going to go back to the gym today but I need to motivate myself, my heart is not in it right now.
I am going to shoot for the Shamrock run that they host here in Portland. This year it is on the 14th, which is a Sunday. I am on duty that day but should be able to participate on the Coast Guard team if my supervisor is ok with it and if there is someone else on duty to cover my qualifications.

There is a 5K, 8K, 15K, and a 3.25 mile walk. Wes said he would do the walk, I was going to shoot for the 8K.
Here is the course map:

It is sponsored by ADIDAS and you get a cool t-shirt out of it. This would be my first-ever race and I wouldn't necessarily do it to be uber-competitive, I need the experience to help me in the future with bigger races I would want to do well at.