Hi there ,you have two problems 1 is back pain and 2nd is shortness of breath upon heavy exertion and both can be managed easily with proper awareness and education. Most of back pain is mechanical and can be cured with just posture correction. Make sure that when ever you sit you sit straight and with back tight. Avoid heavy weight lifting and bending. Do back extension exercise regularly three times a day. And more time when you are in pain. About jogging as you mentioned you had just started so it will be get better and better as you continue. Initially everyone faces same problem. However you can start with brisk walk or even simple walk and can increase speed gradually. Also drink more water for your cramp problem avoid junk food and take proper diet with proper minerals. All the best for your health Thank you