I Am Constantly Tired, Feel Ill And Very Lethargic. I

I am constantly tired, feel ill and very lethargic.
I have just divorced after 45 years of what I thought was a happy marriage.
My ex wife has become extremely aggressive for no apparent reason, There was no aggression until after the divorce. In fact we lived together as friends for the 12 months up until the divorce.
I possibly have diabetes 2 on top of that, I have high blood pressure, which has come on very quickly, never had any until 4 months ago.
I really am not in a good place right now and although I am seeing a doctor he does not seem to be that interested.
When I ask for advice on weight loss and the feeling I have he just tells me I need to deal with that, that he does not have any miracle cures, I don't want a miracle, just a bit of help.