Anyone get that feeling of pure euphoria/ecstasy after eating following a period of malnourishment? What is that??

I recently went for a period of about 1.5 months in which I was eating very little due to some psych trauma work I was doing and a lifelong history of ARFID. I eventually started to get symptoms of malnourment and decided to get it under control. On the first day, I had a smoothie, a multivitamin, and an iron supplement. Sometime about 1-3 hours after that, I started to get weird chills like when peeing after holding it in for a while, but also wanting to stretch. Then, I just started feeling FANTASTIC. Not good as in I was miserable and now I'm fine. I'm talking about better than the peak of the best orgasm I've ever had. This lasted for about 20-30 mins. I was just rubbing my skin and stretching my muscles, which would activate it even more. I had never experienced that, nor had I ever heard anyone share that they've experienced something similar.

Has anyone else had a similar experience?

Also, what the heck was that??