K.A.
Dr Hale's website http://www.infantrisk.com/ has a lot of information of what is safe and not to take while nursing.
Dr Sears website http://www.askdrsears.com/topics/breastfeeding/while-taki... has some good information on things you can take as well.
I would honestly take as little medication as you have to. All it does is mask the symptoms and can make the illness last longer.
Tylenol is safe to take if you need something for aches or if you get a bad fever that other methods don't bring down.
Make sure you drink as much as you can and don't stop nursing your baby. Your breastmilk contains antibodies which will help protect your baby from the illness. Breastmilk can help prevent your baby from getting sick at all, or if they do get sick it is lessened substantially.
Get better soon!