My son 21months had his first injections Tuesday last week. For the first few days he couldn't bend his legs or he'd cry in pain. Other that that he was okay...until 2 nights ago, since then he's been running a fever at 39. Ibuprofen has been bringing it down but when it wears off it ramps back up. Last night he had a fever and was shivering. He's not slept soundly these past 2 night, waking up crying in the night. I managed to get him to sleep earlier at about 7.30ish n he woke up about 10 crying, nothing would calm him, his was flailing around like he was in pain, I tried giving him a drink and something to eat but he refused, further crying, trying to bite me, kicking me, slapping me (this is unlike him). He finally accepted pain relief and has calmed down but has started coming out in spots randomly around his body. He's very pale and still short tempered with the slightest thing but is calm, currently laid in my bed in my arms. Is he okay? I've read kids can have this reaction but he seemed in so much pain earlier