When you begin using pheromones, it can be quite a lot for your brain to come to grips with. I had headaches at first, and was tired after the pheros wore off. But that passed rather quickly, and I rarely have self-effects of that sort now.
There are several threads on here about masturbation. Feel free to use the search tool to check around, what you’re asking about has probably already been discussed here.
Here’s one you might find interesting: