help please hope some one can? ds was in hospital last week

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for red swollen feet, could not walk at all on them, they put in on iv abbes for 5 days , sent him home with 7 more days but all seamed ok ,they thought it was sepitic arthritis we thought was from a swimming pool( thats an other story) anyway last nigh ds 5 woke up screaming in pain with his hand ,arm, i thought he had layed on it! took him to my room and got a shock his arn half way up and his hard was red hot looked like i had dipped it in a red hot bath(like his feet did last week) , rang nhs they said take him in , but i did calm him down so kept him home but now am scared whats he got he wont go to hospital again hes terrifed?

thanks all i understand what you all was saying ,

hes had a good night where usally he wakes and i have to give him meds to take temp down, last night i didnt , and he woke this morning with no temp too so i think hes on the mend ,still going to gp at 9 25 and explain it all.

again thank you all i will come back to say whats happened

been to gp he checked him all over i told him about the Kawasaki disease and what they thought at hospital septic arthrits! he had no temp like i said. he thinks theres loads of bugs and viruses going round most looking like measels (ds had no spots), told him about his arm he said dont sound like hes layed on it as he wouldnt be able to move it ,where he could.
anyway hes not going to do another tests yet unless it happens again we have to take him straight there, or unless hes carrys on being ill, he said he looked washed out.