Collocations for stressed - adj.

be, feel
look, seem, sound
become, get
make sb
She's just making herself more stressed.

extremely, fairly, very, etc.
completely, totally
I was just totally stressed out and afraid I couldn't continue.

overly
She felt overly stressed and needed to calm down.

a little, slightly, etc.
clearly, obviously

about
He's stressed out about money.

over

Stressed is used with these nouns:
syllable, vowel