Hello, im a type 1 diabetic and i suffer with really bad control of it, alongside diabetes i also have autistic spectrum disorder and chronic fatigue syndrome.
Based on this, i qualify for the higher rate of care from the DLA (Disability Living Allowance) and the lower rate of mobility. It works out at about £415 every 28 days.
Then, i also get ESA (Employment and Support Allowance) which works out at £373.80 every 14 days.
Based on what you're saying, i cannot see why your GP wouldnt sign you off work permanently. Its obvious you're really struggling.
I recommend opening up a new claim for DLA (once you've got your DLA in place, thats when you can apply for the ESA), if your claim should be rejected just appeal it. They'll have to hear you out if you wont stop bothering them!