Will I get food poisoning? Or maybe get sick from this?

We've been a little hard up on money and got some groceries from a food bank for the first time. There was just the one container of JELLO pudding and I'd put it in the fridge because I find it tastes better cold. Anyway,I just took it out of the fridge and ate it. As I was eating it, I thought I noticed a bit of a funny smell but I didn't realize it was coming from the pudding container. As embarring as this is, I thought it was because my bf had just taken out the garbage. But then I took a whiff of the pudding container and realized that it was not the garbage at all. So I looked at the container and saw an expiry date of May 2008, so it's been expired for over a year!!! I also started getting a funny after-taste in my mouth once I'd finished, so I drank some Kool-Aid just to try and get rid of it. Anyway, now I'm really scared that I'm going to get really sick. Does anybody know if it will make me sick, and if so is it something to be really concerned about (ie. like food poisoning?) I'm pretty freaked out so any information would be appreciated! Thanks!