have you seen your GP recently? If you need to be carried to bed and can't walk then you really ought to be seen by a specialist much faster than July!! If things get really bad, please get yourself to A&E. No-one should put up with this level of pain and disability, and it sounds as though something is badly wrong.
In what ways is your movement limited - please could you describe this more for us? Are you having trouble moving your arms and legs? Obviously your spine is fused so you won't be able to bend, twist or otherwise move the fused vertebrae, but although you have a long fusion (according to your photo) this shouldn't limit you to the extent that you're experiencing.
Please don't despair