Suffering with left shoulder and left chest pain before my period every month. as well as neck pain?

Diaphragm: One mechanism for your symptoms would be diaphragmatic irritation. That can send symptoms to your neck and shoulder via your phrenic nerve. Given this happens with your period I would be suspicious that follicular fluid from your monthly follicle rupture could cause this.

Musculoskeletal : Musculoskeletal pain may be associated with your menstruation. Please take Motrin and follow up with your Gynecologist.