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Hello, I'm Dr. Deb and will do my best to help with this concern about Charlie.
My condolences to you both on the loss of your husband; I'm sure you're both still mourning life without him:(
As far as his increased thirst and urination goes, diabetes is certainly one possibility. Bloodwork and a urinalysis can confirm if this is the case.
However, there are other possibilities:
1. Kidney disease
2. Hyperthyroid disease
3. Some cats with urinary tract infections may behave this way although it's not as commonly seen in cats as it is in dogs.
Of course, some of these conditions might be considered “better” than others. For example, we can treat diabetes with insulin and/or diet. We have very effective treatments for Hyperthyroid Disease and many of these cats can do very well.It can take a significant amount of damage to kidney cells before changes are seen in the blood so this is not as good a disease to have; treatment is often focused on preventing further damage.It's possible that a good physical exam might pinpoint the problem but usually bloodwork is needed.
I hope this helps to provide possible explanations for his behavior. Deb