With tren I have never experianced tiredness. Actually quite the opposite and depending on the length that I use it, I can get bouts insomnia.
You have not said much about your diet, but I would just try and squeeze in some more protein every day and see if that helps you out. I'm sure you are getting good amount of protein now, but for say a week or so try to get in an extra 50-100 grams, hell it wouldn't hurt.
How often are you working out? How many times a week do you hit each body part? Maybe you could throw a wrench in your workout for a week or two and shock the hell out of it and then get back to your current routine.
Tren for me personally has been a kick ass ride. I've never had better strength gains while on it. I love tren, but right now I'm taking a break from it for a few months.