Books about figuring out what to do next with your life or dealing with crushing grief/nothingness

I'll try to keep this as short as possible since this isn't meant to be a therapy session or me farming points.

In short, despite only being in my late twenties, this year will be the worst in my life. I lost my father who was my only real remaining family. I was put in charge of a large but volatile and poorly documented estate with no will. Everyone else in close proximity in my family ranges from being burdens to just terrible. I've had to be the adult in my family despite having an older sister and a mother and a now a lifetime of mistreatment is really coming to ahead. On top of that, their behavior after the death has forced me to only communicate with them via lawyers.

This entire year has been one incident after another. My car broke down beyond repair the same week my dad died. I realized that the only dream/goal I've ever had in my life (to retire in the house my father built) is never going to happen, I was laid off and the job market is beyond horrible. All I need to do now is lose my dog and I have a pretty solid country song going on.

On the brighter side, my partner has proven why I'm going to marry the shit out of her one day as she's been keeping me on my feet. Plus I don't need to worry about money for the rest of my life due to the estate (Even though I trade every red cent in a second just to get my dad back)

In short, it's been rough and I have absolutely no direction in life. I just spend my days hopping between different types of instant gratification. The good kind (working out, career/investment research and housework) and the bad kind (just shoving a box of donuts and a whole chicken in my mouth in one go). All, while putting off my much larger responsibilities to the estate and career

I'm thinking I need to read some self-health at books. I did start reading the count of Monte Cristo but that was resonating way too well with me. Here are the three topics I was thinking of pursuing.

° books about dealing with overwhelming grief, loss and just the crushing nothingness of reality. I really liked Marcus aurelius's meditations at first but it got way too dry and pointless

° books on dealing with instant gratification problems. I definitely struggle with this and there's no end to the tasks I still need to do on the estate.

° books that deal with how to figure out what to do with your life when you're at a crossroads. I'm lucky that I have time and resources but that's only what I have. I just don't know what to do with my life

Any advice is appreciated and once again I do apologize if this turned into a vent.