Thank you all for your replies yes I know its dangerous to use oxygen without consultant with my gp. The ambulance crew said my oxygen level was low 81 and only when taken off oxygen dropped again and the hospital said the same. I think they don't want to have here my morther in law still smoking plus we have gas don't know why I was asked something blowing us up !.
So now is left some doctors are saying it will help others it's to late , I do take my oxygen level if it's good I not use it but when it's down I will.
Cheers all Rob.