How to apologize

Hi folks,

I'm the ADHD husband. I just got diagnosed and on meds in March of this year. I also am bi-polar 1 and have been on meds for the past 18 or so months.

My focus and energy are better and I'm seeing the needle move on some behavior stuff and others I still struggle with. 

My wife and I will be celebrating our 25th anniversary in 3 weeks. Our story is very similar to others on this site where I exhibited many of the actions and attitudes of a mentally ill person who was not getting treatment or medicine. Those actions and attitudes 100% affected my family in a negative way. 

I know now my triggers for anger are rejection, comparison and being found wanting, feeling less than, and put downs regarding my intelligence. I just learned this last week. 

My question: last November I called my wife while I was out of town and she was upset. I asked why and she grew heated and hung up on me. She wrote a long angry email saying I will never change and that I had talked big about an anniversary trip and done nothing and now she didn't even want to go and that a lot of her friends were going overseas for anniversaries and if I had done right she could go as well. 
I had been working on getting my passport and a budget and looking for flights. I hadn't talked much about it because she said she wants actions not words and I wanted to have most of a plan together before talking to her. 
When I read that email I was triggered, it hit all points, and I tossed all my work and didn't bring up a trip at all or talk about our anniversary. 
 

She's right. In the past I have done those things, talk about X and not execute or just say something to please her and forget or just plain forget. Money is tight. I don't have the same capacity as our friend's husbands. 
 

How do I apologize for this? I feel like I should say something. I can't apologize for having ADHD or bi-polar but can or should I apologize for being ignorant of the WHY behind throwing out my plans? I do not want to blame her. I reacted to her words but I don't think she is responsible for my reaction. She can say or do whatever she wants and I still need to respond correctly. 
 

I'm a people pleaser and hate and am scared of anger and confrontation. I do want to do the right thing though regardless of her response.