The answer to this question lies in understanding the concept of "mind-body" relationship. For example, when someone is appearing for an important examination, he/she may experience palpitations, trembling, sweating, abdominal discomfort, breathing problems and many other physical symptoms. In this case we realize that these problems are due to anxiety
in the mind. The same holds good for medically unexplained pains which develops following excessive worrying or stress
(whihc is common in depression
The multiple symptoms (some of them unrelated) should make you think of the possibility of depression which can present with physical problems. A detailed evaluation by a specialist can help you understand your problems and help you overcome them.