Dear Miss, there are many conditions that can cause the symptoms that you described but It seems to me like abdominal or gynecological story . First, it would be helpful to know your age and your medical history. Pregnancy must be always excluded, but it can also be some kind of missed or early abortion that causes vaginal bleeding. Pain that you are describing seems like position-dependent pain and it can be sign of serious abdominal infection (including pelvic infection) such as intraabdominal or tuboovarian abscesses. The most common vaginal bleeding is benign and it is called dysfunctional uterine bleeding, but without more information I cannot give you the right answer. I should know does it bleed after intercourse, during menstruation or all the time? Shoulder pain is usually referred pain from other place like abdominal cavity (for example abdominal infection as I ve mentioned before) and also you can feel it associated with abdominal discomfort( especially when you re feeling bloated because bloated stomach makes pressure on phrenic nerve). My opinion is that there is high possibility that you suffer from endometriosis... So I advice you to do this: 1. laboratory findings ( red blood count to look for anemia, inflammatory markers to look for infection, urine analysis- uroinfection, vaginal microbiology tests- STDs, estrogen,progesteron and steroide hormone levels) 2. Ultrasound- abdominal and Gynecological !- to search for intraabdominal abscesses, tumors, cysts,endometiosis etc. 3. CT scan if needed Also you should apstinate till your symptoms disappear. Good luck.