Feeling defeated

I feel like a bad mum.

In this past month and half my 6 month has had a chest infection turned croup, covid, and now croup again with a UTI. Idk what to do! He is on another round of amoxicillin and had steriods at the hospital. Ive been there about 5 times woth him this month i feel like they must think im one of those people that make up things for attention and i just feel so shit! Im cleaning the house as much as possible, disinfecting everything and change his nappies every hour! Im so scared of him getting something else and I feel like I cant control it. Please tell me im not the only one