Hi C.,
Oh my gosh I feel for you - and the first 6 months are the hardest!!!!!!
Hang in there! This will all be over in about 6 months as he builds up his immunity. If you were home with him once he went to school Kindergarten would be this way. But yes, it's tough in the beginning.
It's tough to be a working mama for this exact reason. Once they get older figure in field trips, parent teacher conferences, holidays, in-service days etc ONTOP of sick days and some months can definitely trigger panic!!!!! This is exactly why they have the term 'mommytrack'. It's very frustrating. Basically, I end up taking a TON of unpaid days and I go to work when I'M sick so that I can take off when SHE'S sick.
I would definitely look into other daycares. To have to go get your kid with a temp of 99.9 is a bit ridiculous. Most daycares are 100.1 or over and diarreha, rashes, pink eye etc. Is this a center? Sometimes bigger centers have a more flexible policy. Some even have a nurse on staff so you are only called if he's really sick.
I would look on sittercity.com as well and find a college student who has some daytime flexibility who would be willing to pick up your son when he's sick. It's also a good idea to have a sitter you like so you and hubby can start date night again - it can be tough the first year and especially if you are all stressed out over work and sick kiddo and everything that goes along with that. So, I would urge you (with all your extra time hahahahaha) to try and go out once a month even if all you do sit on your front lawn and hold hands.
good luck!