if your going by the actual song: the d should actually be c# and it doesnt switch where you say it does, and there are a few chord changes you missed, throughout the song its basically a, c#, a, c#, a, e, f#, a, e, a (fast strumming and switching)

the vocals do this:

(standard tuning, no capo)

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----0-0-2/4-2-0-4--4-2-0-0--0-2/4-4--2-4-2-0-
-0-2-----------------------2-----------------

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----0-0-2/4-7-7-0--0-2-4-4-2-4-2-0-----------
-0-2-----------------------------------------

hope this helps.

but overall, you tab was good and it helped me, so i hope i helped you.
God Bless
-BOB

my bad, i left something out.

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----0-0-2/4-2-0-4--4-2-0-0--0-----0-2/4-4--2-4-2-0-
-0-2-----------------------2-2-0-0-----------------

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----0-0-2/4-7-7-0--0-2-4-4-2-4-2-0-
-0-2-------------------------------