Not sure on the anger/resentment, but I went through a stage where I did so much reading/research, trying to find purpose and meaning again, it included alot of spiritual reading including things like Buddhism. In a way I absorbed bits that felt relevant to me and rediscovered some understanding/meaning/belief for myself
I also found it hard to maintain motivation for my day job, it made me reevaluate everything - is this what I really want to do?! Is it purposeful?! I was angry I put so much effort in to my work when my dad was going through chemo, balancing looking after him and maintaining my job (I still feel angry about that now and again) It's been a long journey but I have found a new direction and over time I've been retraining. I still struggle with motivation in my work but I have a plan which helps (most of the time).
It was a while into my journey I was in a place mentally where I was able to make progress. But maybe you could start the tentative thoughts/exploration of what do you want to do, what are you interested in, what work would you find fulfilling. Theres several free training options out there to test the waters or try something new to see if you can find it. But also be gentle with yourself, a feeling of purpose and meaning can be fragile in grief - I still get times when I wonder what the point it - it's a slow and gradual journey xx