As a doctor, I strongly advise against self-medicating. While you have gallbladder stones, left-sided abdominal and lower back pain with bowel changes suggest issues like diverticulitis, severe constipation, or kidney problems, rather than typical gallbladder pain (which is usually on the right). Diabetes can also complicate bowel motility. You need an in-person medical evaluation, possibly including imaging or blood tests, to get an accurate diagnosis. Please do not start laxatives or pain relievers without a doctor's approval, as they can worsen certain conditions or affect kidney function. Monitor your blood sugars closely and seek medical attention promptly for safe, targeted relief.