I don't think the damage to the carpet can be reversed. Ins. Co. replaced my dad's wet carpet, but they first pulled the wet carpet out, then ran big fans for 3 days. Then they called the installers to put new carpet in. They said that it would end up mildewing the new carpet if the slab wasn't properly dried out. Three days was the minimum time the fans had to be running.

kudos to your dad for getting them to fix his carpet, but there's no way i'll be that lucky. this has happened to people higher up the food chain than me, and they just tell you to put a fan on it.

is there anything i could spray on the carpet to kill the mildew? this nasty carpet is already discolored from some cleaning stuff the physical plant sprayed, so i don't really care about that. i just don't want to be sick!

There are products manufactured by different companies used by hospitals and food institutions for antiseptic cleaning, and are known as quaternary antiseptics. Some have detergent added to help their housekeeping staff clean, so you do not want those, just the pure quat antiseptic.
Get a little trigger sprayer and spray this stuff on heavily up to three feet around the damaged area and let it dry. That will be the end of your mildew problems, and it will not harm the carpet. If you have a small home pump-up sprayer that will work, just rinse it out when done.
You can try hospital supply stores, or a pro janitorial supply store. I used to treat water damaged carpeting for years with this stuff, and only had a couple of callbacks for mildew formation in water flooding damage situations.
Do this just before you leave at night, because it is pretty strong stuff and you don't want to sit in the office and breath it all day.