Recurrent fever

My baby is getting sick for the 3rd time in the last 3 months. His first 2 I got him checked out & he got put on antibiotics for 10 days the first time. He had an ear infection, sore throat & a fever. Second time his fevers spiked in the evening/night he’d burn up & break out in hives. The doctor didn’t do much for him that time. Just said to give him Tylenol. Now I think he’s getting sick again because he has a runny nose and is starting to get crabby & tugging at his ear, I don’t notice a change in his temp though just his runny nose. He’s 9 months now.

Should I get him checked out or? Is this normal for him to be getting sick this often? (After he gets over his fever I wash everything)