How Can Fever And Exhaustion Due To Severe Constipation In A 12-year-old Be Treated?

my 12 yr. old grandsons mother died 1 yr. ago;and I m raising him now. He suffers Severe Constipation.I did not know about this!HE was in agonizing pain for 19 hrs. or more! 1st movement too 6hrs. and was as big /thick as my 2 hands together;rock hard! For 12hrs. after he was in/out RR w/ diarrhea. Severity of his pain w/ fever,exhaustion was like nothing I ve ever seen!! HE cried just to sleep,but kept having to go to RR w/ diarrhea...Finally @ 3:45am he was screaming,crying for it to come it! Did,Finally but was huge as my fist balled up,length was 5 ! Shocked a child could pass that out his body! HE then told me this has been going on since he could remember. Now after asking his Ped. Dr. for referral. Weeks gone by, now he says it hurts to bad to go! And new symptoms started after giving him white powder fiber, supossitory, and enema was last thing Dr. said for 6 days of this. But now he is going in pants 3 to 6 times daily! Not a full movement, but I m @