Sudden changes in personality are not normal. The causes are many and varied and can range from hormonal changes, infections, thyroid disease, adjustment disorders, personality disorders and substance abuse, to psychiatric disorders, brain injuries, brain tumours to neurodegenerative diseases (including dementias).
Some of our spouses may be experiencing an existential crisis.
Others may possibly be experiencing a health crisis due to a physical condition. The only way to know is to work your way through the long list of potentials, to rule out differential diagnoses. For that you legally require a willing patient.
I knew the language to use to describe my husband's sudden change in personality and out of character behaviours, and managed to get him to seek help at first with a GP, psychologist and psychiatrist. Because he clearly stated he did not agree with any of us and physically kept running out of the room, I couldn't force him to continue to seek help. Seeing a neurologist would have been important to rule out many of the above but I did not have the power to make that happen and was clearly told that even though they all knew something was very wrong with my then husband, they didn't have that power either. His permission was required, which he was definitely not granting.
Medical disorders are not set in stone, with so many overlaps and personal variables and in the case of psychiatric conditions/personality and adjustment disorders, one initial diagnosis may be changed many times over the years, to become something else all together. On average it takes people 10 years to reach a diagnosis of bipolar disorder for instance. None of it is cut and dried.
Humans are not vehicles that get plugged into a computer with the 'results' displayed neatly on a screen in order to be treated. Sometimes more straight forward diseases have clear treatment and diagnostic pathways, but in more complicated conditions, that simply does not occur.
Mid Life Crisis, is one of those conditions. A willing participant in the diagnostic process would certainly be an advantage to eliminating many of the above. Any diagnosis is a process of elimination and even then a definitive diagnosis may not be found.
Instead I am left forever wondering whether there was a physical condition that contributed to the implosion of my MLCer, or was it something like an attachment disorder that left him suddenly indifferent to me and our children, when we previously had been very bonded.
The fact that I will never have an answer to that question, is something that I reluctantly accepted long ago. It will continue to frustrate me though, I do know that.
Regarding bvFTD, I believe it is good to be aware that it might be a potential, just as there is a very long list of potentials.
Not all bvFTD progresses.
There is an anomaly called phenocopy FTD which "In conclusion, phFTD represents a clinical condition with the same behavioral features of typical bvFTD, but without neuroimaging abnormalities and no functional decline. Whether these cases belong to the FTD spectrum is still controversial"
https://alzres.biomedcentral.com/articles/10.1186/s13195-019-0483-2"Related to the issue of clinical misdiagnoses based on the FTDC criteria and further complicating the picture, a condition mimicking bvFTD has been been described and labeled “bvFTD phenocopy syndrome,” implying that patients may display the typical behavioral symptoms of bvFTD but show no progression and no evidence of atrophy or hypometabolism"
https://www.frontiersin.org/articles/10.3389/fneur.2019.00594/fullAs the brain really is the last frontier in medical science, ongoing research continues.
IF (please note, that
IF is in bold) any of our MLCers have bvFTD without further degeneration from the personality/behaviour changes, it seems likely that they may have the phenocopy version. Of course, we likely will never know who may have this condition and who may not. None of them appear to be as curious about the potential as some LBS are. (note again,
SOME).
Most of us will never know what caused this major personality change and crisis in our spouse and we are all left guessing and hoping it is something where normality is able to resume. For every person with that hope, is another that believes there are more potentials than one here. And that is everyone's own prerogative to decide.