Your symptoms are definitely not due to anxiety. This is just a typical refrain by closed minded doctors who have no interest in solving novel diseases. They have been trained to be this way and to deliver prepared statements which end up gaslighting us.
That’s a good article you found about T reference ranges. What would she consider low T? Also, does she have your testosterone levels from a time before you experienced symptoms? That would give a more accurate picture of what your personal range of T is. If your T was the same when you were healthy then her opinion would make some sense. But if your T was much higher when you were healthy, it’s obvious a drop in T is a potential cause of your symptoms. Unfortunately most of us don’t have this info.
Hopefully raising your T improves symptoms but it’s not a sure thing and could worsen symptoms. Only way to know is if you try it. Worth a try if your symptoms are severe and long lasting. Risk vs reward as always.