I wouldn't take my chances for more than 48 hours uncooked.
However... put it on a plate with some lemon juice and herbs/spices and cover with waxed paper and microwave it for a few minutes. However you season it, you can microwave it and I promise it is fabulous and fast. You can then put it into the fridge for a few more days. I will be eating trout that I cooked over 5 days ago for lunch tommorow! I should be okay!!!
Hope you feel better.
also, I would cook it for now.
Fish!! I ordered Sea Bass last night at a restaurant and I hated to do this, but I sent it back. I could smell the rancidity when the server put it down in front of me and I tested a piece just to be sure. It definitely had the wrong taste and smell. I got a good piece of salmon instead. I do not think it was properly refrigerated although it had not been frozen.
Like the other poster mentioned, I think 48 hours is safe. You're going to pick up off odors soon but you should be safe food bacteria wise within that time frame.