I too have had that buzzing feeling. Someone described it as a Cell Phone buzz. It's is exactly like that but more mild. To me it felt like an electric shock without the pain. I think that the muscle theory is on the right track. It could also be nerves. Detoxing may be causing vitamins to be processed differently in your body and low potassium as well as some other minerals do cause muscle twitches and nerve sensitivity. It's almost like an eye twitch but inside. It wouldn't hurt to do the test and make sure it isn't parasites but I had similar twitching and spasms after my c-section. This feels very similar to me. . Water and a banana are good ways to hit dehydration and potassium lows. Good luck to you all, I hope it resolves quickly