Sickness...again

So Collin is sick. Again. I feel like since I stopped nursing him, he just gets sick all the time. When I was nursing him he would get a cough every once in a while, but nothing too bad. In the last 3 months he has gotten pretty sick 4 or 5 times. He's had a fevor, cough, and very stuffy nose since last night, and can't hardly sleep. He'll be fine, and then all the sudden just burst into tears and nothing can make him feel better. Its really hard when he gets sick because there is so little I can do except hold him, or try to give him something, anything to help him feel better. I feel so helpless, and I feel so bad that he has to just feel cruddy for a few days. I'm wishing I could have nursed him longer- maybe that helped him from getting sick so much? I don't know. Anyway, hopefully he'll be better soon!