Coco had the same thing and it lasted a few weeks (maybe about 10 weeks...sorry) BUT I only realised towards the end, that it could've been chocolate causing it. I cut it out and it seemed to improve.
Coco woke herself (me as well) all night grunting. It was so stressful. But it does pass. I did what you've done, the infacol etc (have you tried Brauers wind medicine, it's good, prob best I used) and I did lots and lots of tummy massage. coco only pooed about once every 10 days, which is very normal!!! Infact her poo has only become regular since I started giving her neo care probiotics (fabulous stuff, not sure how old they can be to have it). Worth checking with natropath on that one.
I hope it all passes quickly for you,but hang in there. A couple of drs kept telling me it's normal because they are learning about their bodies and it's functions (that didn't make me feel alot better...) but I guess it's true.
good luck xoxo