The symptoms you are describing are not so unusual in the aftermath of what you have gone through. I would suggest two lines of action. The psychological symptoms you are experiencing, and also possibly the your sleeping problems, may all be helped by speaking to someone; a Psychologist or Psychiatrist may be a helpful person in this instance. Giddiness can be an after effect of something like a car accident. I would though suggest you see a Neurologist and have yourself checked out, to make sure that it is just a benign after effect, and not something else. The Neurologist will also be able to discuss the appropriate treatment with you for the giddiness.