disquiet
worrit
send shivers down someone's spine
worry someone sick
fuss
eat away at
get grey hair from
piggle
concern
gnaw
begruntle
oppress
fear
eat
trouble
cloud
crap oneself
unsettle
geek out
freak out
preoccupy
besiege
unease
sadden
pain
faunch
bemoan
look for
tie oneself in knots
get one's bowels in an uproar
surprise
look to
cark
distract
unhinge
give someone grey hair
anticipate
perturb
disorder
panic
worry
spook
fret
pother
sweat
dread
fray
unnerve
make someone's hair stand on end
grate
fettle
scarecrow
bother
make someone's blood run cold
bug out
sweat blood
deject
make someone's jaw drop
provoke
haunt
fash