You have described a lot of what I have felt. It helps to know other people feel this too. Just a couple days ago, I thought I was a computer program, and not a person. The reason I thought this was because there will be times of eerie synchronicity. For example, I will be reading a word just as someone says it...but this will seem to happen multiple time over a period of days. I used to shrug that off as weird, but lately think similar thoughts as you have described. I will share with you something I have discovered about this. It may just be my own experience, but I think this has to do with some kind of brain injury. It doesn't have to be a major injury, so don't worry about that. I think it can also be from medications, too much sugar, caffeine or alcohol. I had a toxic experience with mercury in a medication. I was having the awful physical symptoms, but the derealization/depersonalization got much worse. I felt comfort in the fact that the DR/DP meant that my brain was trying to heal itself. It makes sense that your brain would put itself into a dreamlike state, so as not to have to expend more energy processing information while trying to recover. It's why we sleep, after all. You mentioned that you had gone through a hard time. I would consider that another form of brain trauma. While you are experiencing stress, there are neurochemical processes that can change your brain, but luckily our brains have neuroplasticity, which just means that damage in one part, will prompt growth or compensation in another part. What has helped me are my pets, and really trying to take it easy and get enough sleep. I have made an effort to avoid negative stress as much as possible. I have noticed that when I cannot, I revert back a little into DP/DR. Do not worry, it will get better with rest.