My 79-yr.-old husband is high anxiety, OCD, phobic, has odd behavior, seems depressed, reclusive and sedintary, is angry and has acted aggressively towards me. He has developed leg venous insufficiency issues with sores and redness, as he sleeps sitting up in a chair and refuses to ever elevate his legs. He mostly stays in the house and has trouble socializing. He is on no medication for anything and seems to otherwise be in good health, and has gotten through colon cancer a few years ago, fully recovered. Sometimes he seems okay but any little thing can set him off. He refuses to share anything with the doctor on his check-ups and otherwise won't see any doctors about his issues. I am at a loss as to how to handle this.
The next time he acts 'aggressively' towards you, call 911 and have him taken to the ER for a psychiatric evaluation. If he refuses to get transported to the ER by the EMTs, you can call the police on him instead, and they will handle his transportation to the ER. While there, ask that he be screened for dementia, and explain his symptoms to the doctors. I begged the ER doctor to admit my mother when I had to take her to the ER for the 5th time for vertigo, b/c I KNEW she had dementia. He agreed, admitted her, and that's how we got mom diagnosed finally.
Don't feel badly about calling the police if DH threatens you, either. Nobody has that right, nor should you ever feel unsafe in your own home. The whole idea here is to get him diagnosed and treated, possibly medicated for aggressive behavior, and if it takes a call to the police to get that done, so be it.
Wishing you the best of luck with a difficult situation.