I'm new to your thread and this whole situation(10 weeks in), but I feel your anxiety on what's to come in terms of what should be celebrations. 10 year anniversary last week, S's birthday (which he shares w/ OW ) and mine both in Oct, followed by the holidays. This will be the first of those alone, so I don't have much advice for you, other than you will get through this just like the others. As mother's, LBS's, we have so much more strength in us than we know is possible.
My H is NC, which leads me to NC and I know the tailspin I get into when I do receive a random text. I blocked him from my cell for about 3 weeks. Couldn't believe the anxiety from just one little text. I see this has been going on for you for more than a year, don't let these things undo your progress. It is a real struggle, but you said even with just writing it out you feel better. That's a plus in my book! I don't know what's worse having contact, NC (when you still have hope) or the bits and pieces then NC. As I type that, they all suck!
Anyway, I hope your days have been better since.
M:43 H:44 M:10 T:14 S:26 BD:7/21/17 H files for D:7/31/17 (haven't been served) PA:8/30/17