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Hi, just checked on Kellysmom for you. They recommend more regular feeding but suggest milk may taste different so baby may be more reluctant. Here's the link: http://kellymom.com/bf/concerns/mother/mastitis/
Also try lots of massaging in that breast while feeding, and also in hot shower and bath that worked for me, hope you feel better soon. Oh and try feeding in different positions to 'drain' different bits of the breast, I was rubbish at expressing too!
Definitely keep feeding, your baby will be better at clearing any lumps with a big feed than a pump would be. Between feeds what helped me was filling a nappy with warm water and putting it in my bra. Sounds very wierd but really helped. As did massaging lumps in the shower right before a feed. Also I second what someone else said about feeding in different positions, I've done dangle feeding before where baby lies on bed and you are on all fours and dangle boob into mouth, sounds bizarre and made my dh look at me very strangely but it totally cleared a nasty lump out!!