Hello Jane and welcome to the Forum!
Don't worry if you and your husband are feeling overwhelmed and lost, that's quite common and understandable
There is good news and bad news -
You can live well with diabetes (often just called D on this forum since we all know what it is), and don't be put off by any horror stories you might hear about side effects like problems with your feet & eyes
He may well have been feeling weak, tired, & lethargic, that is common with D but as you learn to control it, those feelings usually go away
In fact many people say they feel better & brighter with D than they did before
The bad news is that you will have to make some changes to your diet, and probably other things as well; and do this all the time to keep on top of things
Diabetes is the inability to process carbohydrates properly, which means that glucose accumulates in the blood, and it is this accumulation that causes the problems we call diabetes
You can control diabetes by taking tablets and/or injecting insulin, but the best way is to not consume carbs in the first place
So a diet for diabetes restricts carbohydrates, and it is important to realise that this means starchy food like rice, pasta, spuds, bread, as well as the obviously sweet things like cakes, biscuits, & sweets
In fact many people take a diagnosis as the motivation to cut out processed & junk food, eat more veg, get more exercise, and all the healthy stuff we hear about
These have suggestions for diet -
The Learning Zone, the red tab at the top of this page
Living With Diabetes section on the Home Page of Diabetes UK - there are recipes, meal plans, and so on
Read previous Threads on this Forum, especially Newbies, Food& carbs, and Weight Loss
Exercise will help as well - it doesn't have to be a long gym session, Owt's Better Than Nowt!
Walking is good; start with just a stroll round your local streets, back lanes, & footpaths, get out into the fresh air and build it up from there
You don't need serious hiking gear, it's summer now, so comfy trainers & casual clothes are all you need