Hi.. I started Wellbutrin 100mg , 1 per day just 6 days ago, and much to my delight it started working on day 2. Only side effects I noticed was trouble sleeping for the first few days, but went away. But now day 6 seems like it completly stopped working and I was feeling down all day.. Do I need to call doctor and see if I need to increase the dosage? Hope day 7 is better..