Gaffy,
I’m so sorry to learn about the loss of your best friend. Know that you may possibly feel worse over the next few days/weeks, perhaps months, than you feel now. That’s completely normal. I’m struggling with the OD of my dad which was also due to a high quantity of benzos, plus a few other things (not in high dosages) which I suspect he threw into his necro-homebrew for added assurance that he wouldn’t ever see another sunrise.
The most sound advice I can give you is: Don’t blame yourself
The fields of psychology, psychiatry, and psychoanalysis have been in existence for 100+ years, yet there remains a stigma re: seeking help for the non visual or non tangible issues that are bothering you and affecting your emotional well-being.
For whatever reason, men are less likely to seek help non-physical, non-visible problems they’re experiencing, while women are less hesitant, as a whole, to open up about these types of problems and seek help from a professional psychologist or licensed therapist. Women also share their problems with other women more, based on my observations.
My guess is that your friend had issues he didn’t want to talk about with anyone and they seemed insurmountable.