That sucks, mate - I feel your pain. I guess all our fears are that we've done irreversible damage, but reading yourbrainonporn.com seems to suggest otherwise.
I'm still able to get an erection most times with real sexual partners, albeit have the sporadic fail, especially when performance anxiety comes into the mix. As mentioned, I certainly find sex better when I'm off porn, but I also find sex a lot better when I'm comfortable, relaxed, confident, etc.
I find things like Viagra might provide some extra longevity, but not really. If I can't get aroused to start with, it's never going to work.
The other thing I'd probably say is everyone is different. A lot of people seem to say that any orgasm/ejaculation is going to cause huge problems rebooting, but for me, I've always found that a natural orgasm inside a real girl is liberating. It massively boosts my confidence and helps me release any anxiety I had.
My only suggestion would be if what you're doing right now is not working, try some other things. I'm sure people on here would give you a hand (metaphorically) if you mention some specifics about your reboot process.