hi all i have a problem here that should be easy to fix however i cannot seem to ...

My son taj is 2yr 2 months old. He was born at 33weeks (4.5lbs) gestation and has no health problems. He was in special care for one month with fits, severe jaindice (tripple lights 5 times) and a transfusion and just general feeding/growth. He is now on the 70th percentile for height and just above the 3rd for weight.

My concern is that he is EXTREMELY constipated. In the last 28 days he has pooed 3 times. It is so large, hard and crumbly when it finally does come out. The last bout we had it took him 8 hours till 4.30am to finally pass the movement. He was so tired and exhausted afterwards and i have never heard him cry so much in my life. He is now SOILING himself also.

I have tried everything from grape or prune juice to supositries ( he is so clogged that i cannot even put one up there ) to limiting his dairy and trying to get more fibre into his diet. He however does not eat. And its not just him being picky ... He will not let food pass his lips. I have kept his fluids up and am still allowing him milk 300-400mls a day (although i know this can clog him up more) however some days this is the only thing he will allow to pass his lips and its the only calories he recieves.

Today he has had his milk and has eaten 3 strawberries. Yesterday he had his milk and had 1/4 of a banana and 1 dry savory biscuit (bite size). And of course watered down grape juice and plain water.. The day before he did not eat a thing.
He did have a problem with passing his first poo in hospital (it took 41 hours) and they did order down a specialist however he passed it about half an hour before the specialist made it to his bedside. (i dont know if this info can help ?)

Has anyone been through this situation before ? And if so how did you overcome it ?
I do also have a referal to his pediatrition ( he was discharged about 4 months ago) and to see a nutritionist however i cannot get in for another 3+ weeks.

thank you for any insight or advice xx

*** I do also have a 4.5 year old son so i do cook and supply many varieties of meal and snacks and we all sit at the table together so i am at a loss for the not eating.