Thank you for your question and welcome to Health Central's Anxiety Community.
I am sorry you are going through such a hard time right now. Have you talked with your doctor about how you are feeling? Have you talked to your parents? If not, this is where you want to start. Those around you, especially those who love and care about you, should be willing to help you and work with you to get you through this tough time.
Depersonalization or feeling as if you are detached from events, people and things around you can be a sign of Acute Stress Disorder, although I am not a medical professional and cannot tell you that this is what is going on. One of our experts, Jerry Kennard, talked about this in a post, "It Felt Like a Dream," The symptoms of ASD include a reduced sense of awareness of surroundings and a feeling of numbness or detachment from the event or situation. The person believes the circumstances around them aren't real (derealization) and they frequently refer to their feelings as though they were in a dream. Sometimes there is a sense of being entirely outside of the situation, like an observer looking in, but not actually being involved. It is as though the person is floating above or around the situation but their body is in a different place altogether (depersonalization)."
Although this isn't exactly what you described, it may help you better understand how you are feeling.
I do not believe you don't care about all the things you are talking about, but the anxiety and stress you felt over your health scare may have started this.
Again, please talk with your parents. If you don't know how to start the conversation, you may want to print out what you wrote hear and have your parents read it and ask them for help, including talking with your doctor.
I hope this helps
Eileen
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