I do believe lithium can aggravate anhedonia. I am a fairly accomplished guitar player and I have not picked up any of my guitars in over three years. Zero interest. I stopped listening to music a year ago, despite having incredible headphones and amps and stuff. I just made myself start listening again and I must say, I am enjoying it. So, part of it may be just forcing yourself to do things you really don't have the initiative to do and then finding that, after all, it is kinda fun. So, to me, there are two things to anhedonia. There's no initiative and then there's the actual not enjoying things once you actually do do them. Those are different. For me, the bigger problem is initiative. Which is good, because all I have to do is make myself get on the bike and then I know I will get at least some enjoyment. Just my $.02.