I agree with the advice to get a counter, mine helped me through some difficult PMO risky times.
I personally have an unconventional method of phasing out PMO, and while I haven't PMO'ed in over three weeks, I have MO'ed within the last week, though I am now phasing this out too (as was the plan all along). If you do get stuck, you could consider trying my method, especially if you think you are more addicted to masturbation than porn. To determine this, a good question would be what is your ration of fap to sex and porn to non-porn fap? For me, I have hardly ever had sex and have used porn for a while, but fapped without it through my adolescence. So I've done a lot of fapping without porn and therefore could well be addicted to fapping alone, I would say, based on my history. I therefore think that it is unsurprising that I am about equally addicted to fapping as porn, or so it seems to me through my reboot experience.
Apart from reading other stuff on this site, as recommended, you could try Noah's book Wack and/or you could get other self help books like one on willpower, for example. Noah recommends "The willpower instinct" by Kelly McGonagal.
Whatever path you choose, good luck and keep trying.