There is a lot of reading where you will find things that apply to your situation.
Please read these links found here: https://forums.t-nation.com/t/about-the-t-replacement-category/38/2?u=ksman
* advice for new guys
* things that damage your hormones
* protocol for injections
* HPTA restart
* Thyroid basics
Note that we see a lot of guys, who find their way here, who have such problems at your age. So your situation is not in anyway unusual.
Starvation diets can trash your testosterone, thyroid and adrenal hormones. You would need more labs and your doc is probably out of his league.
If you have done TRT only, your testes might be small and might not recover. See the protocol for injections sticky to see what should have been done. Most docs are clueless. But you can only try to see if you can recover. Fertility is another issue that your doc should have been concerned with.
Did your doc test these prior to TRT?
If not, he should be castrated.
We can be very helpful here. But we need labs with ranges, pre TRT and and now.
Starvation diets can also mess up thyroid and adrenal function, with elevated rT3 blocking fT3. Did doc ever test TSH, T3, fT3, T4, fT3?
Explain how you feel now in terms of: