well i was on propecia for 3 months, about a year ago and it killed my sex drive,so i came off it. i recently tried it again for a month and the excact same thing happened, where it got serious and my bird ask me if was cheating on her,at this point i stopped it again, and decided to go all out on topicals,
i tried many things to counter it, tribulus, v****, but nothing really worked, when you stop it jesus you dont realise completely what youve missed,i stopped it 3 days ago and WOW i can notice the difference already,
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im afraid you might be in that 'supposedly' small percent, that has libido problems that wont resolve, until you drop it, but you could try going with a lower dose, and adding tribulus, tongkat ali ect, it didnt work for me but may very well work for you.