Hi, Basically you have stressed your pituitary too hard. You need to quite Gym forever. Permanently stop lifting weights and all kinds of cardio. Most importantly take rest as well. I have done 9 years gym and i am telling you, 'Bodybuilding doesn't matter, all you need is confidence'. Most importantly health is wealth. To drop fat, just eat 3 times a day like any other normal slim guy, then you will be 100 percent fit.
Low testosterone means, loss of energy. You have to restore your health by taking good rest and stopping gym.
In your case you, bad hormones or else cortisol level have increased more than usual, you also might feel sweaty hands, and loss of sex drive, and unstable mood.
Things to avoid, Weights and noisy songs, and especially cardio which is the highest form of stress level activity.
And be aware that over training can lead to serious problems, and low testosterone or loss of sex drive can mean that your pituitary is having some problems like benign tumor or else.
Be very careful and do things in a very human way. Stop Gym Forever Good luck.