Biliary Colic or Cholecystitis: The patient's symptoms of right-sided belly pain, particularly worsened by twisting motions and getting out of bed, could suggest a gallbladder issue. The absence of nausea, vomiting, or diarrhea does not rule out biliary colic or early cholecystitis, as these symptoms can develop later.

Musculoskeletal Pain: Given the exacerbation of pain with movement (twisting motions and getting out of bed), musculoskeletal pain, such as a strained muscle or osteoarthritis, is a plausible diagnosis.
Peptic Ulcer Disease: Although the patient has no problems eating, peptic ulcer disease can sometimes present with pain that is not directly related to food intake, especially if the ulcer is located in a position that causes referred pain to the right side.
Diverticulitis: While more common on the left side, diverticulitis can occur on the right side, especially in Asian populations. The absence of changes in bowel habits or fever does not rule out this diagnosis.

Appendicitis: Although less common in the elderly and the pain is not typically worsened by twisting motions, appendicitis can present atypically in older adults. It's crucial to consider this diagnosis due to its potential for severe consequences if missed.
Hepatic or Renal Pathology: Conditions such as hepatic tumors, abscesses, or renal issues like pyelonephritis or stones could present with right-sided pain. These conditions require prompt diagnosis and treatment.
Ovarian Torsion or Other Gynecologic Emergencies: Though less common in post-menopausal women, ovarian torsion or other gynecologic emergencies can occur and are critical to diagnose promptly.

Right-Sided Inflammatory Bowel Disease: Crohn's disease or ulcerative colitis affecting the right side of the colon could present with these symptoms, though they are less common causes of right-sided abdominal pain.
Intestinal Obstruction: Partial obstruction could present with intermittent pain worsened by movement, though other symptoms like nausea, vomiting, and changes in bowel habits are typically present.
Abdominal Wall Hernias: Though more common in areas of weakness, hernias can occur anywhere and cause localized pain, especially with movement or straining.