I've been getting an Eligard shot every 91 days for a year; have felt lethargic and mildly depressed all this time. Finally realized -- from this site -- that those are results of the shots; a relief.
My suggestion: maybe don't have to continue the intensity of your workouts while getting the Eligard, and give yourself both the physical and emotional break while enduring the shots?
I've slowly been able to do that for myself and it helped.

z