I spent many years in a high stress environment which also triggered past trauma a lot. On top of working 60h per week, I also had bad insomnia for months where I slept 2-4 h.

During this time I showed symptoms that can be indicators for BPD, but I'm still not sure whether my psychologist's diagnosis is accurate.

If I really have BPD, shouldn't I have the symptoms most of the time?

My life has been a lot more stable lately, I've been getting more sleep and eating regularly, my social life is better and I work less hours.

Isn't it kind of "normal" that I was doing badly when my life was bad, and now that things are better, I'm a bit more back to normal? 

During the time of my lows I had a short fuse because I was already at full capacity due to circumstances. I felt depressed, suicidal, and very lonely during covid as well. I also did some things on impulse, but not a lot, there were like 5-6 major events in a span of 3-4 years.

I feel like my psychologist is diagnosing me just based on a time where I was in exceptionally high distress due to my environment, and disregarding the fact that I do not show most of these symptoms when things are going better for me.

There were also very stupid questions in the interview like "I see a purpose in life". Which I answered with no, because I don't think anyone really knows the true purpose of life. I don't even believe that we necessarily must see a purpose. Can't we just live and just cherish the experience without feeling purpose?