heebie-jeebies
qualm
trouble
worry
disquietude
sinking feeling
sick
nauseous
sink
queasy
fever
landsick
sickish
sinking
nauseated
have butterflies in one's stomach
willies
unquiet
anxiety attack
anxiousness
upset
chill
bad taste in one's mouth
nauseatic
creeps
troubledness
anxiostressive
panicked
in a lather
panic
affright
terror
anxiety neurosis
trepidation
ill-ease
despondency
queasiness
anxietize
ew
collywobbles
panic attack
worryful
overanxiousness
apprehensively
blues
uneasily
angst
uneasiness
nail biter
anxiously
existential crisis
disquiet
butterfly
disquietful
doom
scary
give someone the creeps
nauseation
solicitude
crawlies
shpilkes
suspense
feel-bad
cockwaffle
thought
worrisome
troubling
one's blood runs cold
perturbing
worrying
distressful
demon
giddy
horrify
distressing
troublement
disturbing
unstring
edginess
inquietude
maniaphobia
deer in the headlight syndrome
fear
fearfulness
taut
fright
quake
airsickness
nauseating
thrilling