I have been on cymbalta 60mgs for about 4 years. I tried to get off of it because of the weight gain but the withdrawls were horrible so i went back. For the past 6 months I have been getting those brain "zaps" a couple times a week and i feel like i haven't taken it even though i had. A few times I went ahead and took another pill to make it stop. What I want to know is can you build up a tolerance to it and if I need to ask for more or if something like ambilify would make it better?