Mr Dime
I've been following your thread due to professional interest. I am an osteopath, similar to your chiropractors.

If your chiropractor could give you no recommendation other than to take Omega-3 fatty acids then I would suggest that you change your chiropractor because s/he was prescribing the wrong medicine.

Fish oils contain Omega-3 and Omega-6 fatty acids. Chemically they are Linoleate and Linolenate. These are known as "essential" fatty acids because they cannot be mady within the human body. They must be taken in diet where they are found, in particular, in oily fish such as mackerel and herring. A good quality normal diet will contain enough nutrients and vitamins for most people. Supplements are only neccessary in cases where the diet is poor, there is a problem with absorption, or a mechanical breakdown of part of the body has occurred.

You will notice that there is a considerable amount of "faddishness" about diet - what a certain newspaper columnist, or more usually an advertiser, writes or what a certain "celebrity" is taking suddenly is a "must-have" for the general populace.