I'm so very sorry for your loss. You did the very best you could do and I'm sure she appreciated you being with her in the end. I've been there myself and it is terribly hard.
Don't doubt yourself about being cut out for this. Chickens give so much joy and affection. I'm wondering if anything is infecting your chickens and the two that you lost were the first to get sick. I like to err on the side of caution so if I were you I would pick up some Tylan Soluble antibiotics. It is broad spectrum and highly recommended by my avain vet. It has a good shelf life (the bottle I have expires in 2011) and since I did have to use it once I like having it around. I was very pleased with the results. If you can't find it at the feed store you can purchase it at firststatevetsupply.com
When you are feeling a little more like yourself check out your flock really well. Check for runny noses, gurgling sounds, sneezes, coughs and loss of appetite and closed or swollen eyes. Check their feathers also while you are out there. Make sure they don't have lice or mites. Make sure their vents are clean and everyone looks happy. When you go out to their pen or run look them over and if they are making too many chicken sounds for you to hear abnormal sounds just whistle. All of them will be silent and then you can hear if anything is wrong.
Update us tomorrow. Get a good nights rest and take care of yourself.
