Dear friendgenerally back does not causes stomach pain.so I am trying to deal with your problem picking one problem then another.first of all the most common cause of back problem is muscle spasm in and around vertebral column.excessive or overuse of these muscles in the form of lifting weight or bending forwards causes back pain.so what you have to do is give rest to your muscles and do some back strengthening exercise like flexion exercise of back region.and as far as stomach pain and burning sensation is concerned it can be due to excessive acid secretion in the stomach.so regular intake of Ranitidine can give you relief from this nagging pain.i hope in this way you can solve your health problems.my best wishes .thank you.