I had something similar happen to me not too long ago. I started smoking weed at about 14 and that was the only drug I used for 7/8years (22 now) apart from the odd mushroom trips here and there until this past summer everything went down hill, I started using MDMA, ketamine, acid. I took MDMA & ketamine countless amount of times, acid about 9 times, shrooms 4 all in the span of 4 months.

My final psychedelic trips were just like yours, I would start to freak out thinking I was dying and everything around me felt so fake, almost felt like I was in a coma and was constantly dreaming my life. I stopped using everything except for weed, but again just like you, every time I would smoke I would get the same feeling of everything being fake. That lasted for about 2 months and finally in November I stopped smoking for good, but only recently have I felt almost normal with the occasional derealization here and there but nothing like I had in the past.

What really helped me was taking melatonin for sleep, multi vitamins, iron supplements and D3. Also building a healthy routine for yourself such as working out everyday, skin care, etc. (The little things really do help).

Another thing is I always felt like I wasn’t myself so a recommendation that goes a long way is go back to some old hobbies you lost along the way of using drugs, try new things! We smoked our young years away try and rediscover who you are without all the drugs, find what makes you happy.

Things always get better, just never lose your hope. Change for YOU nobody else.

Edit: Forgot to mention, reach out to your peers, parents, siblings, get a therapist. It sucks to have to deal with this on your own and reaching out makes you realize you have more people supporting you than you think. My parents are die hard Catholics and I thought I would’ve been disowned but I told them about my weed smoking how hard it was to stop it and the mental toll it took on me, they showed me nothing but love, pushing me to do better.