I've been taking a high-grade form of fish oil for years. Originally I was recommended Carlsons cod liver oil, then later switched to krill oil. Only took a couple of capsules per day because, let's face it, the stuff's expensive. Recently I've been tweaking my supplements due to SAD symptoms setting in, and thought I would have a go at taking more fish oil. I ended up taking a couple of grams of krill oil, but got stomach upset all day, plus a hammering heart. After another day of this I thought maybe I'd go back to the Carlsons, got some of their fish oil capsules - and had the same reaction at the higher dose. Thing is, I'd read that the omega-3 can help regulate sleep, help the body produce adrenaline, etc - all of which would be good for me. Clearly, though, the higher dose wasn't working. It's not just a digestion thing, because of the heart symptoms as well; it was obviously really stressing my system somehow. I went back to the old small dose of krill oil this morning - and have the stomach upset again. I'm not doing anything else out of the ordinary, so I think it's the fish oil that's still causing this. Now I'm coming across articles on the internet that say fish oil may not be everything it's cracked up to be. I'm a Paleo dieter and am finding this hard to believe. But if I'm not getting any benefit from the supplement, maybe I shouldn't be taking it. My body does not seem to like it. I don't actually eat much fish as a rule, but I have never had a problem with it as a food. Just wondering what others have experienced? Anyone who has had trouble taking fish oil, or who believes it's helped their CFS symptoms?