I'm sorry to hear you're experiencing persistent right-side pain from your shoulder to your leg, especially as it worsens before your period and improves afterward. This pattern suggests a possible link to your menstrual cycle and hormonal changes.

Such pain could be related to conditions influenced by hormonal fluctuations, such as:

• Endometriosis: A condition where tissue similar to the uterine lining grows outside the uterus, causing pain that often worsens before menstruation.
• Premenstrual Syndrome (PMS) or Premenstrual Dysphoric Disorder (PMDD): These can cause various physical symptoms, including pain and discomfort.
• Nerve irritation or musculoskeletal issues: Sometimes, hormonal changes can exacerbate underlying nerve or muscle pain.

Since you mentioned a medication related to progesterone treatment, it indicates that hormonal imbalance or progesterone deficiency might be involved in your symptoms.

Given the complexity and persistence of your pain, I strongly recommend consulting a gynecologist or a pain specialist. They can perform a thorough evaluation, possibly including imaging or other tests, to identify the exact cause and tailor an appropriate treatment plan for you. If the pain worsens suddenly or is accompanied by other symptoms like fever, weakness, or numbness, seek immediate medical attention.To narrow down potential causes, we will need some more information.Please tell me your age and gender.