I guess we are lucky floaters don't hurt . I always thought it was from doing LSD? A thing called HPPD.
HPPD (Hallucinogen Persisting Perception Disorder) may be a cause of visual snow and light tracers but I don't think floaters are included.
Is the fatigue so much that we just don't have the energy to feel excitement?
Here is an article by Cort on HealthRising about some possible reasons for the lack of enjoyment effect in fibromyalgia and ME/CFS.
PEM dulls my ability to feel emotion even more than usual so there are probably multiple contributors.
Have you had any luck with anhedonia ?
I seem to go through phases. Nothing seems to help consistently. Hip lists various supplements to try in the link I posted above.