hugs hun
i hear you on the constipation
one of my premmies had huge trouble doing poos as well- every 2 to 3 weeks and horribly stagnet and huge. he would scream in pain for days before the explosion!

turns out his bum hole was too small and he had to have it stretched - he was having an op at 12 months so they did it then!
we tried everything over the time as well and massage, and a bout in a jolly jumper seemed to work the best for us!

good luck speaking to the pead and let us know how you go!!