continuous
uninterrupted
aggravation
annoyance
bad news
bedevilment
bore
bother
botheration
bothersomeness
chase
chasing
crashing bore
devilment
difficulty
downer
drag
exasperation
follow
follow-up
following
harassment
harrying
headache
heeling
hounding
hue and cry
hunting
molestation
nuisance
persecution
pest
problem
prosecution
pursual
pursuance
pursuing
pursuit
quest
searching
seeking
sequel
sequence
series
shadowing
stalking
tailing
tracking
tracking down
trailing
trial
trouble
blogging
bogging
clogging
hogging
jogging
logging