need help! (venting)

so I just had my baby a week ago and as much as I'd love to enjoy this time that I have with her I feel completely overwhelmed. Apart from my newborn I have 5 other kids to care for. two of which I Foster. 1 has had a cough and congestion for like 2 weeks, one pinworms, another started vomiting today with diarrhea, and the other two are seemingly somewhat healthy. I am at my wit's end and feel guilty that I can't enjoy this time with my newborn, oh and we have issues with latching on top of it all so I'm in like a ton of pain. any suggestions on how to get rid of at least the pinworms.