According to the symptoms you outline (“something in the throat”, dizzy spells, weak right arm, chest pressure, pains in upper neck and lower head), and given all the negative medical test results (X-ray, MRI, CT-scan, ultrasound, blood-work)... it seems that you are experiencing a type of somatoform disorder. Somatoform disorder is a kind of neurotic disorder. Emotional problems can transform and evolve into somatic symptoms without any structural damage of the “affected” organ. For example: it is possible to feel chest pain and hard breathing without any lung or heart disease. Advil (ibuprofen) is a type of painkiller that can reduce headaches. You may consult a neurologist about the pain in the head and neck. If everything is ok, you can seek medical advice from a psychiatrist or another mental health professional.