Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. Sadness, worrying and sleeplessness are common symptoms for so many mental disorders. Your palpitation, pain on neck and shoulders are indicating anxiety disorder. But need to evaluate the type of anxiety disorder, for which the given info is not enough. For your information, this could just be disappointment. Disappointment which arises out of unforeseen life events do bring such symptoms like sadness, irritation, anger, lethargy, lack of interest, lack of appetite etc. Please understand this fact and make sure to introspect. Talking to your friends, out door activities and being creative should give you relief. Find the reason for your disappointment and consult a psychologist if need be. Psychotherapy techniques should suit your requirement. If you require more of my help in this aspect, Please post a direct question to me in this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. I shall prescribe the needed psychotherapy techniques. Hope this answers your query. Available for further clarifications. Good luck.