Hello Friend, Good that you are seeking a help here. Negative dreams, disturbed sleep are symptoms of Anxiety. In fact such emotional disturbance also influence your body function and that's what you are experiencing tiredness, dullness,nervousness etc. Solution here is to manage your thoughts and emotions else, it will further create discomfort to your body. No worries. Anxiety is like any other physical illness and can be cured through psychology counseling and few therapy sessions. Reach me directly or online for further evaluation and recommendation.