Help! - painful boob, blockage I think

[ReneRusso]

Please give me all your tips, I have a very painful lumpy boob which feels full on one side. DD (12 weeks old) has been feeding at normal intervals, so I have no idea why this has happened. I have tried to massage it and press it while she's feeding to try and clear it twice this morning but its getting worse. It's far too hot for a hot bath but I will try anything really. I remember someone mentioning feeding "upside down" - does this work?
Thanks

Lots and lots of info on kellymom.

For me feed feed feed feed was the only thing that worked but there's lots to try.

The feeding upside down thing is not necessarily that helpful as the path from the blockage to the nipple isn't that straightforward but you can try it!