Hi
Am so sorry to hear about you and your dads problems. It sound horrendous for you both and to be quite honest your GP is being completely negligent in my opinion.
Firstly, is your dad type 1 or type 2? If he is type 1 ( and even if he's a type 2 on insulin) then you should push for him to be seen by a specialist team. Either a clinic, diabetolgist, specialist nurse.Most GP's just arent up to the task and dont have the knowledge about insulins in my opinion so he needs to see someone who does? If your dad is not coping, and has hypos to the point of being found in the middle of the road then I would say this is suitably serious that he needs to be seen by someone who KNOWS what they are doing. Dont take no for an answer, put it in writing to GP if you need to.Politely point out duty of care and risks to your father through lack of support. Its too easy to blame him but if he doesnt have the 'tools' how can he manage it?
Secondly, if your dad is having hypos all the time then this suggests to me that he needs to adjust his insulin intake. Although he may take insulin 4x daily the amounts often vary depending on what you eat, how much exercise you do, alcohol, what time of day it is (some people need more in the morning for example). Does he know he is having hypos and ignores them or has he lost ability to tell? Has he had any education about his diabetes and how things work? It would be helpful if you could let us know what kind of insulin he is on and how much-someone could maybe suggestions for you to make though he still needs proper follow up.
Thirdly, as suggested already. A continuous glucose monitor can be worn for 24 hours and gives you an idea of what is going on with sugars during the day. Some people try this when they have unexplained sugars/frequent hypos but it might be that some basic support and education might help your dad.However, they do exist and you now have the jargon. I think a Gp would not necessarily have access to this, hence the clinics.
Does your dad test his sugars, does he have a meter etc.
In terms of work, Disability Discrimination legislation recognises Diabetes as a disability for employment purposes. They need to make 'reasonable adjustments' for his condition and that includes allowing him to test, allowing him to eat and take breaks at times compatible with his condition etc.. Also in terms of benefits, he would maybe get disability related benefits if he is unable to work via ill health, though you would be better to seek local advice from SW dept, welfare rights, money advice place etc.
Lastly - if you think your father is confused and forgetful over and above hypo times, dont let Doc put it down to diabetes. Insist on additional tests. If he has had periods of unconsciousness then problems need to be ruled out. Even a basic blood test would be a start
Hope this gives you stuff to think about
Best wishes
L