Being blunt, I think you've just scared yourself shitless and you are actually in all likelihood fine bro, with the bulk of your erection issues being stress related. That is not me criticising, issues with mental stress causing ED are very very real. Just relax and go about your life without freaking yourself out.
True story, several years back I confided in my best friend regarding my PFS issues and the effect they were having on me sexually. My friend has a full head of hair and has never taken anything like fin, and after hearing about what I was going through and thinking deeply about it he had his first (and only) bedroom failure with his partner the following day. The mind is powerful stuff.
And if you do wish to do the protocol to cover all bases, by all means go with it, without the herbs if need be. But you seem to ask should you do it then tell us you're healthy so it wont help. You've already made your mind up in that regard.
I think you need to focus on beating the demons in your head and the fear they are bringing first and foremost, irrespective of whether your issues are finasteride related or not.