I adore trout, I must buy some! Fresh tuna is a source of omega-3, canned tuna is not because it's cooked outside the can and the fats are lost. Never have that does not sound fun: the closest I got to a feeding tube was making up total parenteral nutrition in the hospital pharmacy clean room many years ago.
I never used to like or eat any fish at all, I forced myself after I got sick enough not to work, I was literally gagging the first time I opened a can of salmon! Now I will eat salmon, sardines, mackerel and trout but struggle with everything else, the more delicate ones as a fillet, the stronger ones only in a recipe.
I very rarely shampoo I conditioner only wash (cationic), but use a sulphate free cosmetic 'base' for shower gel which contains a glucoside (non ionic surfactant) and a betaine (amphoteric/ zwitterionic). I've linked to it on the other thread and I buy in bulk, it's a UK supplier but I am sure you can source similar in the US.
After the last time my mother had a rash from sulphate surfactants I persuaded her to use the identical product as shampoo. Between mother and I we have atopic eczema, allergic contact dermatitis, irritant contact dermatitis and seborrhoeic dermatitis, my father has xerosis on his hands but he won't listen. I have been all but clear perhaps two and a half years, except tiny patches on my head which are triggered by my hair dye (sulphate and silicone free but alkaline of course).