Hi Jadebear. I get what you are saying however it is a process of trying to slowly re-train your brain not to associate the two things any more. Bit like accepting a relationship is over and you are no longer with someone but out of habit you refer to them as your husband and you remember their birthday etc etc.... the only difference is this 'date' is associated with trauma.
Let me try and explain what I am trying to say. I gave up smoking on my son's birthday many years ago. For the first few years ever year on my son's birthday I would think I haven't been smoking for 1 year, 2 years and so on. In my own mind, somewhere along this journey it wasn't important to remember when I gave up smoking as I knew I had given up. I didn't need to worry about when it was and how long it had been, the date, nothing as I knew I had given up. I know don't even think about smoking let alone it being an anniversary on my son's birthday.
An anniversary is something you choose to remember. Have you ever forgotten someone's birthday just because you had so much else on your plate or mind or hadn't had contact with them lately and thought about them? This proves we have the ability to fill our minds with our things to enable us to forget so doing something different might be a good start.
Remember, as you are getting stronger, you now get to choose how much hold the past has over you. You remember your son's birthday as it is important to him and to you. Your trauma, while happening on a certain date, is not something that needs to be remembered and acknowledged as you are allowed to set it free and lessen your suffering. It's hard work but I believe you can do it. I have had multiple traumas and if questioned as to when they happened I couldn't remember as I chose to put them behind me in the sense they are no longer part of my life. Yes they changed my life and affect today but I have not given them the power to take an entire day away from me every year. If I did that I could spend half a year in misery. See my point?