Mate, good to see you posting but I really hope you don't mind me saying to perhaps lower, if not cancel any expectations you've got in your head. You've taken it sore in terms of exhaustion and lethargy, if I were you I'd be getting running out of my head just now and not beginning to focus on that until the exhaustion eases. No time frames or expectations, just as it comes and feels better. You know your own body and it'll tell you what's right.
I'm sure you'll battle through it fella, just take it easy.