Hello I am a solicitor with over 15 years experience I will try to help you with this but I do need a bit more information. What job is it that you have been doing? How long did you do it for? How old are you and are you still able to work despite the back pain?
I am in court at the moment but will get back to you this afternoon.
Ok what you should do is get advice from a specialist personal injury lawyer. If you are a union member then they may have a firm that they refer people to. You have suffered an injury at work and it looks like your employer may very well be responsible. You may well have a claim for compensation for damages arising out of injuries suffered as a result of your employer's breach of employer liability rules and or negligence. You should follow this link http://www.apil.org.uk/injury-lawyer to go to the website of the Association of Personal Injury Lawyers "find a lawyer" section and click on the accident at work and spinal injury links to find a solicitor local to you who specialises in this sort of thing.
You will almost certainly be able to get a free initial consultation and very likely, if your case has merits after full consideration a no win no fee agreement may be available.