i'll give you a quick lesson in human needs for fat and my opinions on udo's oil:
the human body only has an actual requirement for 2 fats, what are commonly referred to as omega-3 and omega-6. using a supplemental flax oil like udos oil is not doing 'something extra' for your body, it is just supplying your body with what it needs to function. the effects on mood and energy you were feeling are normal, well documented in scientific literature, and again not an 'extra' effect... likely what you are feeling is just the result of correcting a deficiency in omega3 fats which is allowing you to function as you should be.
omega-6 are very prevalent in most westerners diets, sources would be: nuts, soy oils, canola oils, fried foods, salad dressing etc. most people are actually getting way too much.
omega-3 however, because in food is only found in limited amounts in flax, walnuts, fish and leafy greens tends to be on the lower side of people intake.
both meeting total 3 & 6 needs are important, as well as maintaining the proper ratio of 3:6. both deficiency and improper ratio are extremely detrimental to human health, and play a causal role in many inflammatory disease (cancer, heart disease). shoot for a total intake of about minimum 2g/day of omega 3 and maximum 8g/day of omega 6. ideally this ration should be 2:1-3:1 of omega6:omega3... dysfunction begins to occur at ratios above 4:1. most westerners float in the 12:1-20:1 range.
that all being said, for most people omega6 supplementation will not be necessary. omega-9 isn't a necessary fat, and is a technically incorrect designation... this is put on supplements packages because 3:6:9 is catchy and allows for higher pricing. Udo's oil is good, but extremely overpriced. For most people purposes using plain flax oil (the omega3 source in udo's oil) will be better.
i hope this was useful for you, please let me know if you have any other questions
“The unawakened mind tends to make war against the way things are. To follow a path with heart, we must understand the whole process of making war within ourselves and without, how it begins and how it ends."