Some antidepressants cause weight gain.
Back to the fasting blood tests --actually, unless your doctor ordered a specific like a hemoglobin A1c test or a fasting blood sugar specifically, it probably wasn’t done.
Also, in order for diabetes to be diagnosed, not only do you need the hemoglobin A1c to be over 6%, you also need to have at least two fasting blood sugars which are over 125, and they’ll usually want to check to see a glucose tolerance test. If your husband is on steroids that can temporarily elevate blood sugars too. It sounds like he is on a lot of medications (many of which can interact); also a lot of FOODS and non prescription medications can interact with prescription medications, making them super (too much) or sub (not enough) effective.
You might want to have your husband’s MD order a full battery of endocrine tests (hypothyroidism is another endocrine disorder that can contribute to weight gain). High blood pressure can lead to renal disease too, so your doctor will want to do a urine test for blood, sugar, ketones, protein, and microalbumin too.
You have my prayers. It is hard to deal with these chronic illnesses, and it’s often easier to deny or to suffer with what you have because you fear if you try to ‘learn’ you might find out something ‘worse’ --as if you only ‘get worse’ when you try to find out!
Yes, it’s true that when he hears what he knows is right it’s easier to blame you for ‘nagging’ and thus relieve himself of any responsibility. You might want to just go ahead and schedule that full battery for both of you; see what the doctor says, and then YOU go ahead quietly and do what YOU need to do. If the dietary habits need to be changed, you make the ‘good stuff’; if he has to get up out of the chair and walk someplace to get donuts or chips he’s at least moving. . .You aren’t nagging him, either. Smile a lot, praise him for anything positive he does do, try to focus on ‘non food’ things to talk about, bring up lots of positive things like how nice it looks in fall when the leaves turn, put on some cheerful music, bring in some fresh flowers, etc. When he sees you seeming to be more focused on enjoying life (and not ‘nagging’ him), he might start to relax a bit and gingerly try out a few things on his own (those tasty low carb treats, the fresh fruits, the cute little ‘weights’ you’re using just walking around the house (my sister has little 2 lb. pink ‘weights’ she picked up at a local fitness center), maybe a walk around the back yard to admire where you’ve put in some bulbs for spring, or put out some decorations. . . Go for it!