Yes, it's possible for you to walk again if you were able regain muscle strength. Exercise is another important component of your treatment. A combination of cardio and strength-training exercises can work on muscle weakness and give you more energy. If your muscles have become weak from lack of use, resistance exercises using weights can strengthen them.
Your physical therapist can help you develop an exercise program that meets your ability level and accommodates any limitations you might have. Sometimes MS affects the muscles of the foot, making it hard to walk in a normal heel-toe pattern. As a result, your foot may drag on the ground when you walk. This is called drop foot or foot drop.