I’ve had a full blown manic episode that lasted 4 months followed by a hypomanic episode. All up 6mths.

Being psychotic and borderline psychotic for that long can have an awful impact on your brain as it struggles to recover, the impact on everyone you know etc is unpredictable.
My memory - forget “I can’t find my keys”. It was a case of standing at the top of a flight of stairs at a train station thinking “I don’t know how to get down stairs. I don’t remember”.

Mania strained my marriage and I was semi estranged from my kids. I encouraged one of my kids to study uni in a different city where he had no support system. He went on to attempt suicide.

I went from being highly intelligent to being the opposite.

Once it dawned on me how much damage I had done while manic, I switched to suicidal and was hospitalised again.

It has taken me 3 years to finally feel some level of stability and to get my brain back.
I think if your pdoc knew that you were playing Russian roulette manipulating your moods you’d be put back on regular meds faster than you could blink.
Also hey, if you want your grandparents last memories of you to be in an unwell state then that’s up to you.