Are their any pro-long side effects to taking fish oil?

This reason is to treat my anxiety/panic/depression because of smoking weed (gad), caffeine od(panic), and ptsd from guns being put to my head. I am taking 5800mg (4800mg of fish oil and 1000mg of flaxseed) 3x a day. Amazingly I have had great sucess and my symptoms seem to be subsiding after only a week of use.