OK, I'm stumped. What you said about oils is worth looking into though. I know coconut oil is one of the best. It also delivers MCT medium chain triglycerides for energy. Avoid the cheap machine oil they sell on the store shelves. The whole Omega oil thing was oversold but the balance is still important. Too much Omega 3 is the problem, from what I remember. That's in the cheap shit, and many processed foods. Research Omega 6 vs 3 for your issue. The Omega 9 is not required in large amounts. I think that is olive oil.

Try:

Macadamia nut oil: great for cooking, smells awesome
Coconut oil: put that shit in smoothies, tastes great, organic, non-GMO