Okay, thanks for the details. Puts things in proper context.
Doing HRT for 2.5 years will certainly destroy your male sexual function unless you take preventative steps. You say you are unable to achieve an erection anymore, even with physical and visual stimulation. That's not good, obviously, if you want to have sex as a man.
My advice is to see a doctor and have your serum total testerostone and free testosterone tested. Your doctor will prescribe a drug to boost your T back to normal levels. You'll also want to discontinue NBE for a time to allow your body to restore male sexual function. The whole process could take months. When your testes have recovered to the point of again producing testosterone, you should be able to stop the T medicine.
Eventually, you can go back on PM for NBE. To maintain male function, however, you have to take regular breaks to temporarily raise your T levels. It's during these breaks that you should be able to reach orgasm, although the amount of semen may be greatly reduced.
Alternatively, you could switch from NBE to a suction method (e.g., Noogleberry system) for growing breasts which will not affect your sex hormones at all. A few on this site have used suction with good success, but it takes dedication.
I hope this gives you some ideas for how to deal with your problem. There are many threads and posts on this forum warning guys about the ramifications of herbal NBE on their sexual function. I'm surprised that over the years, these warnings didn't register with you.
Good luck whatever you decide to do.
Clara