I had bad anxiety and derealisation ( the thought that nothing is real) from smoking weed for about 9 months. I would go through phases of daily smoking and weekly. I would have severe panic attacks and I thought I was brain dead. Since I stopped smoking I had less and less anxiety and the derealisation seemed to fade but then once a month it would return. I haven't had a panic attack In three months now and have no longer any derealisation. I thought I had permanently damaged myself. It's amazing how the brain repairs itself. Time cures everything and although you may feel like your situation is worse or better than mine was at the time you will get through and will live life normally again. Peace