Vowel Movements or the Comings & Goings of My Vocables

Today my A’s 
been led away.
My weeping E’s 
turn’d in her keys.
Search low; search high: 
I cannot spy 
my I.

Insists my O, 
“I gotta go.”

“As I must, too,“ 
includes my U.
Each goes “adios,” 
as -- sometimes -- goes 
my Y.

My A – hooray! – 
now’s back to stay.

Re-greet my E 
at early tea.
“I’ll not deny 
our old school tie,“ 
says I.

“I’ve miss’d you so,” 
remarks my O.

Appends my U, 
"I miss'd you, too."
(I need ‘em nigh – 
yes, even -- sometimes -- 
Y.)