Morning wood makes me relapse

The important thing to remember is YOU make you relapse, not morning wood. Whenever you make a mistake and slip up you have to remember that. That is the only way you can build from it and improve for the next time. That being said, morning wood typically does not automatically come with sexual thoughts, so are you perhaps associating getting a boner with PMO which is causing you to begin to fantasize whenever you get morning wood? If so, then start there. Separate the two mentally and realize that it is normal to get boners but the presence of one does not necessarily indicate arousal nor does it mean you are preparing to engage in a sexual act. I get them occasionally throughout the day but they come on completely randomly and are not a result of sexual fantasizing. You must learn to keep your sexual thoughts at bay and learn to disassociate erections from sexual activity/fantasies. Don’t dwell on the thoughts and allow them to pass. When you feel like you’re on the verge of relapsing close your eyes, clear your mind with some deep breaths, and sit in silence for several minutes. This has helped me in the past. Practicing mindful meditation can be a great way of breaking this association between fantasy and getting erections.

 

That's rough, I've had that problem too. Have you tried taking a cold shower when you wake up?
As opportune as it is, I've found that the MO from morning woods are really crummy, even if I use a bunch of P, and make me feel like I've ruined my day. For me there's literally nothing enjoyable about it. For now that seems to be enough to keep me away from doing it and similar to what Dagger said helps me tell myself that a sexual act need not come from it.
It's a sign of good health, not a sign that you need PMO!

Keep at it man!