Reaction to fish oil !

I restarted taking fish oil a couple of day ago and change formula to a more powerfull one I have not use in the past :

http://www.ascentahealth.com/products/human/nutrasea-hp-200-ml


And after about a day I started to feel really sluggish (calmer in a way), pain in my body , really fatigued headache (that I never get) and I also got a bit of Acne for the first time since stopping work a few months ago.

I was taking 1 and a 1/2 teaspoon a day , I have since went down to 1/2 teaspoon daily.

the supplement was obviously making me go trough some changes , could this be some form of detox reaction or adaptation period.

Can fish oil usually cause those kinds of reaction. ?

The really annoying part for me is not the fatigue and other symptoms but mostly the Acne (2-3 pimple) I got in reaction. It is really annoying because with AF my skin takes a ridicoulous amount of time to heal and I will be left with 2 red mark on my forhead for awhile.

Anyways , should I push trought with that supplement or maybe switch brand ??

What kind of fish oil you guys take and in what quantities ?