This was your first experience of TRT? My doctor has explained that in the initial stages of therapy the body's own production of (reduced) testosterone is ongoing. It, along with the injection and topical gel, are giving you a very nice lift. You are also likely experiencing dopamine levels your body isn't familiar with - things are good. And then your natural production of testosterone is shut down as a result of the exogenous testosterone you are applying. You feel flat.
I experienced the same thing and, after a good-faith effort, was switched from Androgel to injections. The topical gel simply didn't boost levels to where they needed to be. I learned that I -and you, possibly - aren't unique in an inability to benefit from transdermals; a lot of men have that problem. Injections have been successful in my case. That may be where you will find an answer.
