The decision of the tribunal on (I assume) 4th September 2012 was looking at your* condition when the original decision was made on your claim. If things have worstened since then you should contact DWP and ask for a 'supersession'. This would trigger a reassessment and you must be aware that you could end up with less than you have now. If you do ask for a supersession, it will be entirely up to you to prove that your condition has significantly worstened.
* I have said 'your' condition as I am unsure who the claimant actually is. In some intances you have referred to 'he', in others you have spoken in the first person.
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
