[IngvarLynn]

I've experienced something similar and I believe D3 is not to blame.

I took 5k iu oil softgels and got a unique and indescribable BAD feeling. It crept up very gradually over the course of a month and a half and I had a hard time realizing what was happening. It took me over a month to recover after I stopped.

Another time I've taken 2k iu dry D3 and had zero side-effects.

A couple of years after that D3 mishap, I tried some omega-3 and after a two weeks I realized that that unique bad feeling was making a comeback.

Again, another time I tried a different brand of omega-3 I had no side-effects.

I have a bunch of food sensitivities. So I believe that was a reaction to some contaminants in the oil.