As per your explanation I can say you have a severe back issue at your lumbar spine and disc level. I strongly recommend you do not delay in treatment or else it will become worst day by day. Here you have to do MRI of your back and need to see what exactly the problem is in side. Based on report take opinion from ortho as well physio and they will guide you further for conservative care medication and physiotherapy as well exercise management. If there is more damage then doctor may suggest for surgical management too. I suggest to do needful as per your report and along with physio do use hot pack and pain reliving ointment also. Take care.