Oh! I exclaimed, much relieved. 
( ( ( ( ( Oh ! ) ( I exclaimed ) ) , ) ( much relieved ) ) . )
(ROOT (S (S (INTJ (UH Oh) (. !)) (NP (PRP I)) (VP (VBD exclaimed))) (, ,) (FRAG (ADJP (RB much) (JJ relieved))) (. .)))
I shrieked in terror at the thought, and almost barfed.
( I ( ( ( ( ( ( ( shrieked ( in terror ) ) ( at ( the thought ) ) ) , ) and ) almost ) barfed ) . ) )
(ROOT (S (NP (PRP I)) (VP (VP (VBD shrieked) (PP (IN in) (NP (NN terror))) (PP (IN at) (NP (DT the) (NN thought)))) (, ,) (CC and) (ADVP (RB almost)) (VP (VBD barfed))) (. .)))