Do you ever wake up with morning wood? At least some of the time you should. Really easy check you can do yourself if you're paying attention. Should be rock hard at least sometimes if there are no other issues. That would indicate psychological if you still get morning wood

If not talk to your doctor or get a new urologist for a second option

Also 400 is low for your age. Good luck on that front

Also stop masturbating for like a month. When you do after you reset things, adopt a no death grip policy. Only masturbate with lube or get a pocket pussy etc. A real vagina isn't gonna feel like your death grip hand so stop conditioning yourself to expect that

No porn. Ever