Yes, it does feel flu-like when you get plugged ducts.
A plugged duct is when a plug of milk develops in the duct. It doesn't really become infected or need antibiotics until it sits there for awhile. Any body fluid that sits somewhere where it's supposed to be draining all the time, gives only pain at first, but then can become infected if it sits there long enough. It's the same with ear infections. When they first hurt it's just the pressure of the build-up of fluid. It's not infected until it sits there for awhile. So if you can manage to get the baby's suck to pull out the plug soon enough (the baby works better for this than a pump does), you could get the plug pulled out before you need antibiotics.
One suggestion is to put heat on just before nursing, to help the milk flow, and then cold on just after nursing, to help stop the milk flow, so that it doesn't build up again behind the plug.
Another suggestion is to nurse more often, to help pull out the plug.
Another suggestion is to alter the position that you nurse in with each nursing--cradle hold, lying down, nursing lying down upside down (with baby's legs going up past your head). Visualize your areola as the face of a clock. Sometimes plugs can happen when the same position is used all the time, because the same ducts are getting sucked a lot on or sucked on less, due to the position of the baby's mouth.
Another suggestion is to avoid the "cross-cradle' hold, in which your hand is behind the baby's head. This hold has been shown to cause a lot of problems. Use instead the "Cradle hold" in which the baby's head is in the crook of your elbow.
Another suggestion is to check your bra for tightness. Sometimes a bra that's pressing some duct too much can cause a blockage which then becomes a plug.
Another suggestion is to nurse a lot, drink a lot, and rest a lot.
Here's more ideas....
http://search.llli.org/site/apps/s/google_search.asp?q=pl...