ISO help cooking with frozen shrimp that's been over frozen

[simplicity]

mo, I eat a lot of shrimp. I bought 2 lbs of precooked frozen shrimp once, thinking it would save time in a salad I made. It saved time, but it was also tough. I kept most of it in the freezer - well, in front of the freezer to remind myself to use it. Two months later it was still in the front of the freezer. I finally decided to throw the whole mess away. You might have bought the same brand as I did.