Thinking of you, Sandy. AA is not the only route, have a read of this
https://www.uk-rehab.com/treatment-rehab/therapy/five-alternatives-to-12-step-meetings/
Too much alcohol over a long period can affect so much of the body, and older people can feel the effects much more. Stomach ulcers; liver; heart problems making you breathless causing difficulty walking; malnutrition; balance; blackouts/seizures.
Even your sleep will be disturbed leaving you tired. Depression is a common symptom, or cause.
This doesn't mean that you don't have health issues unrelated to your drinking but the drink certainly won't help.
Take the appointment you've been offered but also book an MOT with your GP.
I believe you are in your early 70s. Far too young to be thinking about death, you can have a lot to look forward to, you have more adventures to plan.
I wish you well