Hey 53. You are not starting OVER...just keep that in mind. The counter can be a source of inspiration, but it can be discouraging as well.
Make yourself a spreadsheet. I use one that starts from the day I last PMO'd. I track days since last PMO, MO, % of days that I PMO or MO and all kinds of other data I've come up with (such as I MO 1 out of every however many days). On day one, I was PMO'ing 100% of the time. Since a PMO is also a MO, I was MO'ing 100% of the time as well. Every day away will make those percentages drop. Let's say you made it totally clean for 25 days...then you would have been PMO'ing 4% of the time or once in 25 days (that once being the your last acting out on day 1). So, you screw up on day 26 (day 25 since last acting out), then your PMO'ing now 7.7% of the time or once every 13 days. That is TONS better than 100% of the time and once a day, every day. Mess up twice on the day you slipped, well that is acting out 11.6% of the time, or an average of once every 8.7 days.
The goal is to keep progressing, not worrying about starting over. After a slip, a few good days will keep those numbers shrinking and headed back in the right direction.
I've been doing the same thing but including MO as well as PMO. While not really worried about cutting MO out of my life completely, I feel that limiting it is helpful. I thought about installing a MO counter, but felt it would be discouraging to see it reset to zero all the time. In the end it seemed more of a positive to see the averages slowly move in the right direction.
It might sound a little OCD, but it is truly more helpful than counters and the mindset of being completely back to square one. Also, logging in the info and looking over the history of data can be encouraging as your streaks build in length. YOu can more accurately see your pattern of behavior and possibly pick up on negative trends as well. Let's say your MO sessions start to rise noticeably...ten you may need to watch yourself closely b/c too frequent MO can easily lead back to PMO.