the urge to fap to porn is really strong what do i do to combat it?

Urges will be there. But urges means you are making progress. Go back to days when you were addicted to porn, surely you won't have felt this kind of urges.
Here's what you can do :-
1) Get social:- Go and visit your friends and chill with them. It will give you positive feeling and you will come back home high on confidince.
2) Worn yourself out. Before doing this you will have to look at your body first. You can do a very intense and hard workout until your body gets so tired that it can't move a muscle. While doing this turn on some work out music in your phone. Urges would prevent you from doing this but once you get started it is very easy to continue.
3) Do something not so easy and not so challenging task which could give you a sense of accomplishment. Like preparing yourself a good snack or cleaning your house or something just like that.
4) Now since you are battling the urges, try to avoid all the possible triggers you can read about triggers and how to avoid them on NoFap forum.

Just think that Urges are your opponent and you are a MMA fighter fighting the urges in the Ring. Go completely all out. There is battle going on in your mind and don't let the urges get better of you.
Never Retreat. Never Surrender