So I also gave up coffee (typically about 4 cups a day) when I started my challenge. I am only 15 days in (90 day hard mode), but I have been flatlining since the very start. I suffer from PIED, or at least I did 3 years ago, which is the last time I've had a sexual relationship with anyone. I still assume that is the case, because my P habit hadn't changed until 15 days ago. I've felt very lethargic. I'm getting good exercise, eating very healthy, and had plenty of sleep (part of the reason I gave up coffee). I seem to have brain fog at times, and I also tend to be dwelling on some emotional trauma from last fall when I need to be focusing on work. Does anyone know if the lack of caffeine has impacts on dopamine and my neural pathways? Does caffeine impact ED? I haven't seen anything on YBOP linking these things. I expected flatline at some point, but this was instantaneous and I think is going to be my life for a while. I also can't seem to get excited about anything. I can pretend, but genuine excitement and joy just aren't there right now. Is it the caffeine or the lack of dopamine? What do you all think?