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Arcticblast
Broke my front tooth last May by falling on a driveway. Admittedly mine wasn't as bad as yours, I didn't damage my pulp, still I know what you are going through about the eating.
I assume you got some sort of fake half tooth filling in my now so it sort of works and functions like a real tooth. If you haven't you might want to look into getting that. Anyway, on using your damaged tooth again for eating, you want to give it a break for a while, for now you just want to be able to drink liquids with it without crying, so like water and stuff. Eventually move up to solids, I believe the first solid I munched into was sponge cake. After about 2 weeks I was able to bit on soft food like fruit bars like this.
Bananas are also a great thing to start out on.
After a month or two it starts to get better, you will be able to eat hamburgers, with interestingly aren't that bad. Still you want to watch out because if you bite something too hard you will feel a crap load of pain even after months.
Also, temperature. Unfortunately you won't be able to eat much really cold for a bit, it is just to painful. Even now I have problems eating ice pops and stuff. If you eat them you have to be really careful and make sure to eat them in little bits. Heat shouldn't bother you much, at least it didn't bother me, I only got pain if I ate something overheated, like a pizza right out of the oven. A general rule of thumb: if if is something that would usually burn you when you ate it before, don't eat it now.
I still can't eat thick sandwiches and apples, but outside of that I am pretty much good.