Every time I've ever tried any type of fish oil within a few hours I start suffering from intense anxiety to the extent I have troubke sleeping. This has happened with many different types of fish oil. The day before yesterday I took just 1 krill oil supplement and I've felt anxious ever since. This has happened on so many occadions with so many different types of fish oil that it can't possibly be coincidence.
The anxiety subsides after a few days if I avoid taking fish oil. It's a very unusual and scary reaction.