Struggling with Emotional Numbness and Lack of Purpose

I've started becoming numb to most of my feelings. It's getting hard to enjoy things and I'm noticing how I'm changing as a person for a while now. I've gone through years of therapy trying to outgrow past trauma and just try to get my life in order. I've no energy, no motivation and overall unsure of my purpose. All the negative head chatter haunts me daily and I honestly just use THC to deal with it. Was on medications for depression but after a while it just seemed less effective and I got tired of driving an hour and a half for appointments and picking up my meds. Everything is just hard and I just don't understand what's wrong with me. I'm "TIRED".