Gas, apparent discomfort, foamy poop, grunting/squirming... yep, we have all that, too. And all my kids have had it. It seems to resolve within 1-2 months and the probiotics do seem to help in the meantime. Besides the "I Love U" technique you can try pumping the legs into baby's stomach and back, stimulating the anus with a wipe or q-tip (cover in lubricant like petroleum jelly), more forceful burping techniques (like the ones in Happiest Baby on the Block where you jiggle baby like a cocktail shaker), various brands of gripe/colic water, elimination diets (usually dairy, but gassy veggies, beans, etc. can exacerbate gas as well), and homeopathics.
Mostly, I'm holding on, just waiting it out.