Synonyms for Worrying (same or very similar meaning)
WordNet sense 1 (causing distress or worry or anxiety):
distressful, distressing, disturbing, worrisome, perturbing, troublingWordNet sense 2 (marked by great psychological weight; weighted down especially with sadness or troubles or weariness):
heavyWordNet sense 3 (the act of harassing someone):
bedevilment, torment, badgering, tormentFrom the ODE community, based on WordNetadd/edit