Poor you and poor you little boy! Hope he is feeling better. I was diagnosde aged 4, so can really only tell you what it is like from your sons point of view!
As Sarah says, "special diets" are not required, but like with all toddlers, encouraging a healthy diet. If your one year old is like my one year old..this isn't always easy! Nothing is forbidden...my parents were very good, and tried to tell me that I couldn't have chocolate...which was fine when I was little, but I did rebel terribly when I was older...I guess it is like being on any diet. Being told that you can't have something is sure to make you want it, if you know what I mean.
I am guessing that he is too little to understand what is going on, and in teh early days, I would find a healthy diet that he enjoys, and have that all week, and see how his insulin needs are. Remeber that milk has lots of carbohydrate in it, and will need to be included when considering his insulin needs. Once you have a feeling for how his food and insulin requiremnets change, then vary his diet a little.
The good news is that you now know what is going on. Diabetes can be difficult to manage, but you will learn how to cope and deal with things as you go along. There are 2 things that, in teh short term can go wrong. Having blood sugar that is too high, and having blood sugar that is too low. Knowing how to deal with, and recognising the extremes is very important, exspecially in a toddler, who probably won't be able to tell you themselves...but they do learn quickly! My little one is not diabetic, I am...and at 18 months, she knows to give me sugar if I looka t her in a funny way. My husband tells me how she will try and give me sweets if my blood sugar is low. She also tries to copy me doing my injections. Now, I am in no way suggesting that she could actually do either of these things for herself, but she thinks they are normal, and she copes.
I can ramble on for hours, which is no real use, but if there is something specific you would like advice about, or just to vent some frustration, you know where we are!
Take care,
Jill