Four months without any physical activity can cause atrophy and weakness in muscles; therefore, normal post-surgical atrophy can be the cause for your current discomfort. Lyrica is a medication used for treating neural pain. In your case, the neural pain is being caused by pressure on the spinal nerves by degenerated inter-vertebral disks. In my opinion, Lyrica will not help bladder incontinence. Bladder control is a complicated reflex mechanism that includes sensitive and motor vegetative nerves. These nerves needs at least 6 months for recovery. Sometimes, if the pressure on the nerves lasts too long, the damages are irreversible. Therefore, you can consult with your surgeon and therapist and identify solutions for bladder control.