sugar in boiled water acts as a painkiller for very young babies. we were probably all given some by our mums, but when i told my health visitor that i used it she was utterly horrified! VERY old fashioned, apparently!
you do have to be careful not to over-use it, because the baby will love the taste, of course, and want more than he ought to have.
tewy, have a look at what you're eating, especially if your diet changed at all recently. all the usual allergy culprits can apparently cause a breastfed baby discomfort, as can chocolate, curry and oranges. they didn't affect my ds but friends found that their diet affected their babies.
what i found very effective was to drink fennel tea regularly myself, and to give ds a teaspoonful or so every day. in the evening i'd sterilise a bottle and leave a teabag (Dr Stuart's Botanical Wild Fennel) to steep overnight, then the following morning ds would get his dose and i would drink the rest. it worked very well.
also try burping him mid-feed (if the interuption doesn't upset him too much) and between feeds.
while you're burping him you could try this: sit him on your lap, support his head, and gently tilt him right the way over on to his left side, back up and right the way over on to his right side.
i never laid ds down on his back immediately after a feed. i either held him uprightish or put him down on his tummy.
i had a VERY windy boy!
good luck