Head, neck, arm, chest pain sometimes altogether and sometimes just two body parts together. happens pretty often, and has been happening off and on for months, what could be the cause? i do have acid reflux?

Time to see doc : Whenever experiencing protracted symptoms not explainable otherwise, an exam with detailed history and possibly tests will be needed. Best will to start with your doc, reflux is not likely to cause your symptoms, too many possibilities otherwise, somatic and/or mental.

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!