Day4- 4am

Ugh...! Just ugh! :(
Little man is finally asleep. He's been fitful tonight - tough to get to sleep, not sleeping long. Around 2:30 am he cried out - went to him and he was eating his nasal cannula. No nurse in site even though his sats had dropped and he was agitated. Got his bottle and he slowly ate 1 ounce. The whole time he had his left leg pulled up to his belly... Just the left and he wasn't kicking it, just holding it tucked up. (He did the same thing last surgery when he had the PICC line in his right leg - it hurt him and he kept that leg bent and close to his body.) I knew something was hurting him on that side. Asked the nurse for more milk - they keep my breastmilk under lock and key- and a diff type of bottle to see if he could eat easier out of a DrBrowns. She brought everything in and I asked her to look at him - showed her his tucked leg. We checked his leg, foot, tummy... Nothing. Chalked it up to maybe that central chest tube hurting him. She left. He couldn't sleep. His pulse has been up for about 12 hours - in the 140s- 150s when they had been in the low 120s. No one was concerned as it falls in the normal range, but we knew this wasn't normal for him.
I heated his milk... 3:30 am. He's still awake and still tucking that leg up.
4 am getting agitated so I reposition him...rolling him on his right... Mindful of his RA wire, his chest tube, pulse ox, oxygen cannula, placed his left arm on his side - it was still wrapped and boarded from surgery - an arterial line and a PIV line with his fluids. His upper arm sticking out above the board was rock hard and twice normal size. I rushed for the nurse and she got the doc. His iv had gone bad and had been pumping all the fluid into the tissue of his arm, not his vein. It's a grade 4 - whatever that means to the docs. To me it means his hand and arm were purple and so swollen they felt made of stone. Cold stone and it had a bright white area like a big blister where the iv went in. It looked excruciating. We are having someone from ortho and plastics to look at it - see if there will be lasting damage.
They took out the iv but had to leave his arterial line in until after his chest tube and RA wire come out. I just want everything off that hand now! That was the hand he would chew on... And twirl his hair... And grab his ear in his sleep.
I feel awful the signs were there and I missed them... Please don't let him have lasting damage from this:(
I hate this. so mad at myself... And mad at the nurses... And myself again.