Ds had rsv when he was 5 months old and it was awful. We had to do the nebulizer treatments for about a week and the medicine made him wide awake. He was in daycare at the time and got sick every other week. Ear infections, pink eye, and other run of the mill viruses. He built up a strong immune system and now at 9 he gets just minor colds and coughs. He hasn’t had a sick day at school since kindergarten, knock on wood.
It's probably worse since you're tired and run down. Hang in there, you're doing great. These times are so hard when our kids are little! Just thinking back to the illnesses and hospitalizations when my kids were young make me shudder. Hopefully he's moving in the right direction now.