Basically Destroyed all my Progress...

If you get back on track today then you will likely have only set yourself back partly, carry on relapsing though and you'll soon undo all of your progress.

 

The euphoric feeling is a good thing.
As someone with a LOT of experience of relapsing after long streaks, I have noticed that jerking off once after binging after a long streak does not set me back significantly. Hell, sometimes even 2 or 3 times don't hurt me that much (which happens often, since getting into a binge rage is the natural "catch up" mechanic of our stupid brains).
As soon as you feel "euphoric" you can still stop and keep some progress. It's INCREDIBLY hard to do, but you have to try.

However, if you keep going, there will be *that* session (it may be the 3rd, the 4th or the 5h) that really pulls you into a black fucking hole. That's when you start feeling super bad about it, develop mild depression and actually find it easy to stop again. Unfortunately, reaching that stage of post binge clarity usually comes at the price of all your progress.

So stop now while it's not too late.

 

Take steps to reconnect with your reason for no PMO and activities that helped you early in your 100 days.

 

In a constant FLATLINE for 21 months. How did your FLATLINE end ? How does it feel ? Can you describe the sensation in words ?

 

It feels like going through puberty all over again.