Sometimes I feel like nothing is real. Im an observer, everything is dream-like. Other times I feel like nothing exists outside the scope of my senses. Other times I feel that my bones and organs are made of metal and plastic/rubber (ie my bladder resembles a catheter bag).
Degree understand your concerns went through your details. I suggest you not to worry much. This happens when you are detached from the circumstances and world around you. When you are in your own world. Everyone feels this. You can analyze yourself with this aspect. Just keep a log of the happenings. Keep a record of thoughts and feelings just before these detached feelings. You day Chat Doctor.  Be in your own world for some time. And then you wake up, naturally, for some time, everything feels strange. You feel detached. That is what happens. Nothing to worry. Don't think of or associate this with any mental problems. For more psychotherapy techniques, You can post a direct question to me in this website. Include every detail as much as you can. I shall prescribe some psychotherapy techniques to control your condition. I am sure that the techniques should be a success. Hope this answers your query. Available for further clarifications. Good luck.