A few months ago I wrote as mom, 92 and totally sharp was suddenly having weird episodes of deja vu and also connecting unrelated people in elaborate stories. Had brain wave test and MRI both normal. Discovered B12 was off. Shots helped. Was doing great. Episodes stopped, gait better, even her hearing was sharper! Missed two shots and it started up again. Sodium levels found to be slightly off. Took sodium pills. Did better as soon as sodium got in normal range. Then started taking thyroid hormones as levels were slightly off. A few days later delusions worse again. Scary ones for her. Have appt. with kidney specialist scheduled (kidney function is slightly off but not by a wide margin) and trying to get one with geriatric specialist. Any ideas short of sudden onset dementia? May be grasping at straws here. In between these delusions, she is doing her taxes, paying her bills, cooking her meals, reading insurance policies and sounding great. But then suddenly convinced she has HIV (???), that someone purposely stuck her with a needle, that there are tests that were taken and when the doctors "FIND OUT" they are going to make her stay in the hospital. Doesn't want to tell anyone and get the nurses who tried to hide the truth for her sake "in trouble". Weird stuff like that. And it seems that as soon as you get her to realize that one delusion wasn't true (the dr tested her for hiv just to win her trust) the story morphs into a related delusion so she's back to square one thinking she has it (within minutes of accepting the results she pushed forward the date of the "needle attack" to after the test was taken so she is still "in danger of having it." My mom was never a hypochondriac or an alarmist or a storyteller. NOT a drama queen in any way so this is just so out of character. She is losing weight. Is eating healthy meals. Any ideas what could be causing this beyond the obvious sudden onset dementia possibility which I realize I must now begin to accept as a possibility? Any ideas would be appreciated. I realize I am probably in denial but just trying to think of any and all possibilities before resigning myself to that. Yes, I know that having had her 100% sharp until 92 is a rare blessing. It still doesn't make it easier to accept and I feel I owe it to her to explore all possibilities of what could be causing this and how to reverse the progression. Thanks for any ideas you can toss out there.