Its disheartening to read about the problems that you're facing. You are facing social phobia as well as finding it difficult to do various activities along with shallow breath and persistent headache. Most of what you described are symptoms of Social Anxiety Disorder. You would need to consult a clinical psychologist for a detailed evaluation to make a diagnosis and to device a treatment plan. It will need a combined approach, consult a clinical psychologist for psychotherapy and psychiatrist for medicines. Meanwhile, you can practice any relaxation technique like Progressive Muscle Relaxation (PMR) for 20 minutes everyday.