I feel your pain mama. My dd2 developed RSV at 8 weeks. It went in diagnosed for three weeks. She was in the hospital over a month. It caused permanent scarring on her lungs.
We did neb treatments every two hours for six weeks and Flovent twice daily with an aero chamber.
I used the mask when she got older. I know it's hard to hear them cry, but it actually gets the medicine deeper into their lungs. The machines are loud no matter how you administer the treatment.
It does get better! They eventually are not scared by the noise and learn that it helps. Dd is ten now and she gives herself treatments! Lol