'So quick,
my memory is elusive,
diminishing quickly.
I'm losing my sanity.'
`I didnt really like 'so quick' it wasnt poetic to me, and it wasnt the strongest beginning line. Maybe try a synoymn for quick like instantly, and just take out so because thats not poetic. Plus you used quickly after diminishing, repetition like that can tear a poem about very quickly.

'It's moving quicker,'
`I know youve improved a lot since this poem was written, lol. You repeated quick again... and I know you are much better now with controlling repetition.

I really loved how you made 'sanity' disappear as you read the poem, you drop one letter. That was a unique idea, really truly (: I thought it was great. It confuses the reader a little bit but its easy to catch on to!

Well done... I know youve wrote better pieces since this, I just thought Id comment anyways. :]