Wendy, take a deep breath!  Everything will be fine, dont give up!  First I think you should consider that you might still be fighting off the stomach virus or you may have something more than you thought.  If you continue to feel sluggish, go get some blood tests to make sure there isnt something else going on.  Dont expect that you will just jump right back into your program.  Often times you need to backup by a week or two and repeat those workouts.  Assuming you are healthy and your body is ready to go, start by creating some good runs for yourself.  For example, go run an easy mile and get in a good stretch.  Take it easy and start building back up.  Throw in some cross training like cycling or the ellipticial.  Have fun and dont take it too seriously.  Dont put too much pressure on your self, you have time!   Dont forget this is supposed to be fun.  Keep in mind if you push the envelope too much, you will end up injured and thats the worst case scenario.  So dont give up, just relax and go slow and have some fun.  Keep me posted and good luck!