[sfem]

While I would suggest growth pains and other sensations such as burning, itching, and tingling are likely enough indicators of growth, there is no inherent logical path to the reverse. In other words, just because you decide A implies B, you shouldn't infer absence of B from absence of A. You don't need to be tingling to be growing.
Regarding mental effects, it has been my observation that people who report mental or emotional changes quite often realize them first when they stop taking PM. Not always, just often. That observation is of course only based on being on this forum for a long enough period of time to see a number of people discuss their experiences with it. I also personally believe that most people are not affected mentally in more than small increments anyway.