I was diagnosed with Panic Attack and general anxiety when I was younger and as I learned to manage certain parts of it, I seem to have developed an unfair idea that I can't be a burden to anyone and that I don't deserve the grace that I give everyone around me. Almost like a perfectionist mindset I guess.

With that said, my girlfriend and I have been dating for a year and a half and I really think she's the one I want to marry. The issue is that more recently, we've been getting into heavier conversations that lead to a disagreement or argument. I know everything we've talked about is absolutely important for our relationship, but Everytime we talk about something that we're not fully on the same page with, I feel like I've failed or something and just shut down. It's like a wave of depression hits hard and it can last a day or two. This has really been putting a toll on me because we've been having more heavy conversations and  disagreements recently. She can feel alright almost right after the conversation, but  I just feel like I'm holding everything up because my mind just won't let me go back to normal as soon as the conflict is resolved. 

How can I stop (or at least mitigate) my processing time? I just feel like recently more of my time in the relationship has been trying to recover from conflicts rather than enjoy the otherwise good relationship itself. She tries her best to be there for me but I just don't know how she can. I am going to therapy but i want to see if anyone has had a similar experience and maybe learned how to deal with it.