This all sounds very familiar - the first thing to do is to have faith that it will pass, because it will, I've been there. The second thing is to know that it is normal, if your mind has endured a high amount of stress and anxiety, or sadness, then the mind eventually shuts down to protect itself. You may have experienced depersonalisation, where everything feels like a dream and nothing feels real, including yourself. Doctors will mainly help if it is actually affecting your social functioning to a significant level - if it is, then see one, but it is possible to feel this way but still be able to function at work or school.