Hi Tan,
I have a big pot in the yard with Gotu kola (Centella asiatica) and Brahmi (Bacopa Monnieri) growing in it. They're both pretty hardy creeping herbs, I just give them a water every couple of days.
The brahmi is actually called memory herb on the label. I have a couple of sprigs/leafs of each most days, and I do think it helps. Especially when Im having it every day.
Its probably a lot more concentrated in a tablet form, but this is enough for me, and cheaper
I think Ginko is another one. I have read about trials using it for dementia patients.
Has your doc tested your hormone levels? Im on natural progesterone supp at the moment, too soon to say if its helped, but its supposed to help with depression and memory.
Good luck finding something that helps