RE: The real reason eating meat/dairy is bad for you (It has nothing to do with what you are thinking)
I was also a vegan for a short period of time and that was the healthiest I had ever felt in my life. I would sleep for only 2/3 hours and wake up and actually want to go for a run. Lol. I have also never had meditative experiences like I did when I was vegan.
Unfortunately though, I am weak. And so I find myself back on the dairy. I don't like many vegetables, so it proves rather difficult to sustain a vegan diet.
Can I ask how long it was you were vegan for? If it was a short period of time, it's possible it could have been a shock to your system and your body needed time to adapt? - and I add, I don't mean adapting to not eating meat, more like, withdrawal symptoms from all of the additives/chemicals/drugs that are in the meat you were eating.
When i started to want to loose weight i became a vegetarian and that lasted years , before i saw fat sick & nearly dead and decided i wanted to do that for 30 days, right after that i went another 30 days as a vegan . Right away i noticed i had zero sperm (i was shooting blanks) my hair started falling out, i lost a severe amount of strength. I had to do a bone meal broth to help fix the leaky guy i had developed from being a vegan, I was thinking i was way to alkaline and my body was not braking down the material i need to live . The ketogenic diet is fixing everything that being a vegan did to me.