Should I tell PIP about my worsening health?

I would like some advise please, I have suffered from cervical and lumbar spondylosis for over 20 years due to a works injury which I could cope with, Up until 18 month ago, I was on the lower component for care indefinitely, as well as having asthma, chronic tenosynovitis, COPD.  When I went for my PIP assessment due to my problems etc, I received 11 points which made me 1 point away from the enhanced, however when I spoke to welfare rights he advised me that he thought they were generous due to working full time.  I received 2 points for mobility despite informing them I could only walk up to 50 metres, he assessed me at 100 and no more than 200.  At the time I didn't realise the that the pain I was now experiencing was due to a bulging disc at L1 S1 as well as L4.  I have had a spinal injection which hasn't worked and have been on the sick for the las 2 1/2 month, due to the chronic everyday pain this has also caused depression.  I have been attending a pain clinic for several months now as well as having counselling sessions.  I have been to see the spinal surgeon today and states that there is nothing he can do for my condition and just to continue with the pain clinic, do you think it would be worth contacting PIP for worsening health or are they likely to potentially with draw the PIP I already have.  When I spoke to Occupational health they advised me to either leave through ill health or reduce my work days, however as I am the only wage in my house, what experience has other people had.