Girls, my son has tummy ache like before, like colic, wants to poop, l…

Girls, my son has tummy ache like before, like colic, wants to poop, lifts his legs, can't, burps won't come out((( I want to do massage on his belly, but he doesn't like it, cries... took a pillow to his stomach and he immediately fell asleep... what should I do? We have holiday days now... can see a pediatrician only in 3 days...