BBarb, I'm so sorry to hear of all your troubles with your eyes.
The thing with diabetic eye damage is that generally by the time you have any symptoms of anything wrong in your vision, it's quite late in the game, maybe even too late to save the vision in that eye. Things are much more treatable and much easier to treat if they are caught early, but they won't be caught early without regular screening. I say this more for your husband than for you, if he's waiting until he "feels sick" to see the doctor (i.e. until something is noticeably wrong) -- he WILL NOT have any symptoms of problems in his eye until the damage is already done. You don't get blurry vision or fog or pain or headaches or anything that suggests that you should maybe get to the doctor, until you suddenly have a bleed in your eye or a (possibly permanent) black spot in your vision (here's a nice simulation of what it looks like https://youtu.be/PqrdnGoYLEc
) If he wants to catch problems at the stages at which those problems are treatable, he needs to attend regular eye screenings - and not assume that if his doctor hasn't brought it up, it isn't important.
It's standard practice with diabetes to have your eyes checked every year with a retinal photograph or slit exam or both (with or without dilating drops - usually with though!). In the UK I believe this is part of the NICE standard of care for diabetic patients, so if he's not getting referred for an eye check once a year it's definitely the doctor's office that is falling down on the job!