mrsD,

Thank you very much for your help and suggestions, but I want to say again that the purpose of getting the Omega 3 from the beginning was to speed up recovery from my PCS, not to treat ADHD. The concussion recovery is much more important to me right now because the PCS worsens my ADHD, sleep quality and many other things.

You are right that 18 grams a day were too much. I stopped taking Omega 3 for now because these huge amounts greatly suppressed my immune system, but I will return to taking it very soon at lower doses.

Regarding of where I got the links of possible damages of Omega 3 daily regimen (almost all of the major risks are attributed to high/very high dose usage), here they are:

Low doses of fish oil may have a mild immunosuppression in humans:
http://www.ncbi.nlm.nih.gov/pubmed/1833105

Polyunsaturated Fats Suppress The Immune System:
http://www.functionalps.com/blog/201...immune-system/

Omega 3 & PUFA’s: What No One Wants To Talk About:
http://metabolichealing.com/omega-3-...to-talk-about/