Make the allergist appointment NOW and get some bloodwork, see if it's the fish, the oil, or what. Some people are even allergic to stuff that things are jarred or canned in, like the material lining the jar lid, for instance.
Stumbled into Primal due to food allergies, and subsequent elimination of non-primal foods.
Start Gluten-Free/Soy-Free: December 2012; start weight 158lbs, Ladies size 6
Start Primal: March 2013, start weight 150lbs, Ladies size 6
Current: 132lbs, Ladies size 2
26lbs lost since cutting the crap.