I'm pretty new to eating vegan etc. but yeah, I kind of have that...like my stomache feeling kind of queasy when I think about going back to milk/eggs etc. Or when my someone uses butter to bake something.
The only thing I have yet to master is: checking every lable for animal byproducts.
I always forget to check the lable for stuff like bread, where one would think it's obvious they don't contain any animal products. Like today I bought some rye bread..and as I was happily munching away I happened to check the ingredients (little habit that I've had every since I could read) and it said something like 'milkpowder' >_<
So now I have this little packet of rye bread on the kitchen counter...and I'm not sure if I should finish it or not.