Tell endo you have almost EVERY low t symptom and that it's affecting your job. If he orders blood work research these forums on what labs to order but make sure they get free and bioavailabe T, the male sensitive E2 test, thyroid panels, dhea, pregnenalone, and a bunch of other assays. You need these to establish a baseline so you know what your numbers are BEFORE GOING ON TRT. If he does prescribe trt I recommend test Cypionate injections.
I learned a lot from allthingsmale.com. You might even consider going to an anti aging doc. Good luck.