Sorry to hear you have had such an experience with the whole vegetarianism thing! It sounds like you may be deficient in rats maybe. If you consume dairy, you may well be ok, but if not, good sources are avocados, coconut oil, coacoa and almonds.
If a person is deficient in fats, fat soluble vitamins also cannot be absorbed.
The main issue with things like supplements is bioavailability. Some supplements can only be absorbed properly in some forms or combination with certain foods. It's definitely better trying to get nutrients from their original sources, so foods like 'superfoods' are not to be underrated.
I'm tempted to try a vegan diet for a few months with a well planned diet as an experiment to see whether a physically active (I cycle about 100 miles a week) meditator might have any negative symptoms.
I think that once you eliminate certain food groups from your diet, it puts pressure on making sure that what you do eat is of the highest quality.
My diet has actually made me feel amazing, and while it may possibly not be a functional system for you, it could be something to think about if you really don't want to get back on the meat wagon! It's formulated from
A typical day for me (Ultra low gluten, meat and dairy free:
Breakfast:
Handful of oats
2 teaspoons Maca powder/buckwheat/millet mix
Small handful of sunflower/pumpkin seed mix
2 tbsp goji berry/mulberry mix
1tbsp cao cao nibs
Small handful mixed nuts
1tbsp flaxseed
All served in a bowl with oat milk
Lunch:
Something simple and carbohydratey. Soup. last night's dinner, toast with coconut oil and marmite. Spelt Spaghetti. I don't take my lunch as seriously anymore as it is just to keep the day flowing smoothly.
Dinner:
Lost the ability to cook creative meals recently, but all meals tend to consume similar ingredients. Amaranth (complete protein), palm oil (good source of saturated fats), quinoa, lentils, brown rice or spelt spaghetti, engevita (b12), lots of onion and garlic.
1 litre of fruit juice (wouldn't recommend this due to the sugars especially if you can't regulate your sugar levels properly atm, this is for a very active lifestyle)
About 80% of my diet is organic, this means I get a much higher ratio of nutrients in my diet.
As a person that has had issues with nutrition in the past, I've learned to stock all my nutrients from real foods and ditch the suppliments now I no longer need them. It cannot be complained upon

I'm aware it might not be of any help at all hearing another person's diet considering the effort you've put into your own, tailored for you, but I have posted this in the hope that there may be information you find useful anyway.
Below is an article for fat deficiency symptoms. Have a look if it clicks and if there is enough in your diet

http://freefitnesstips.co.uk/dietary-fat-deficiency/