First off, you have other options than just clomid or TRT. Those are certainly options for you, but they are not your only ones. I get that shattered dreams is trying to help, but it would be helpful if he dialed down the pessimism and fatalism a little bit.
Second, it seems to me that you are very focused on post finasteride syndrome. You certainly have a bunch of the sexual symptoms of post finasteride syndrome, but you haven't mentioned many of the other symptoms:
Muscle atrophy, weakness
Decreased oil and sebum production
Chronically dry, thinning of skin
Melasma (brownish macules and patches that typically affect sun-exposed areas on the face)
Tinnitus (ringing in the ears)
increased fat deposition, obesity and elevated body mass index
decrease in body temperature
Reduced HDL cholesterol, raised fasting glucose and triglycerides
People with post finasteride syndrome certainly have low DHT. You also have low DHT. But you have no history of taking anything that would cause post finasteride syndrome, and you are missing a lot of the symptoms of post finasteride syndrome. The fact that you have low DHT does not mean that you have post finasteride syndrome.
Also, the rest of your lab results look inconclusive to me - there's no pattern that jumps out as obvious. Your T is not amazing, but its not terrible either. Going on TRT or clomid at this moment seems like it would be a shot in the dark. Better to be patient and not jump the gun on those things.
Let's take a step back here for a minute. On the downside: You have a bunch of shitty symptoms. You don't have one diagnosis to explain all your symptoms. You have a bunch of docs who are giving you the runaround. These things all suck.
On the upside: You are young. You have time on your side, and young bodies can overcome things that old bodies can't. You DO have a concrete diagnosis that could explain SOME of your symptoms.
It seems to me that you can choose to focus on the downside if you want and get fatalistic and give up. Or, you can choose to focus on the upside, start treating based on the diagnosis that you DO have, and don't let some stupid docs push you around.
Even if it takes you years to sort everything out, you have a lot of time. Imagine yourself at age 60 looking back and saying "well, I lost 3 or 4 years of sexual function in my 20s, but thank god I kept at it and got back to health by 25 and now I've had 35 years of great health and great sex." You should mentally prepare yourself that you are not going to feel normal right away. There isn't any sort of magic cure that's going to make you feel great in two weeks. Accept that this is going to be a slow process, your focus should be on feeling a little bit better next month than you do this month, not on being 100% fixed next month. If you string together enough months where you feel better than the previous month, then you'll get there in the end.
Personally I would go back to the neurologist and tell him "I finished with the endo, now treat me for my nerve problems or I will find a neurologist who will." Don't let him push you around. He knows more about health in general, but its YOUR health, and you know more about YOUR health than any doc does.
Fix the problem that is currently in front of you and then move on to the next one. This is going to be a multistep process. You should assume that you have more than one issue, and you will need to treat them in sequential order. Like one member here Sam had problems with thyroid, adrenals, and also low T. He first worked on thyroid and adrenals and had to try lots of things to get those working better, and only then could he treat low T with success. You're going to probably need to do something similar.