The funny thing is, the same happened for me. I could only get it up with tadalafil.
Yet half a year later I decided to take the deal with the devil: What good is my libido if I can't get hookups anymore due to hair loss? I'd rather keep my hair and lose my libido. And so I went on finasteride again. The most feared and vilified medication in existence. I just took the finasteride and swallowed lots of tadalafil every day and things just worked that way.
Half a year ago I decided to switch to dutasteride because I felt like I was slowly losing ground again. I still couldn't get it up without my penis pills and was always nervous about timing them correctly to not be embarrassed during sex. But then I ended up in a relationship which kind of reduced this stress. If I can't get it up, I can't get it up and I don't care. There are other ways to satisfy my partner.
And guess what: My penis actually works and I can have sex -any time I do not plan it. What I want to say is: I read all this nightmare fuel about fin and dut and suffered from severe nocebo.
People worrying about hair loss are neurotic. Those that take fin or dut after reading all their scary side effects must be super neurotic. We are easy prey to the nocebo effect and playing mind games with ourselves.