Guilt OCD, Treatment meds?

[PotterBook1]

Hello... My OCD started in September and I was put on Luvox. It gave me depersonalization, so stopped it right away. Then I was put on Prozac which gave me intrusive disturbing images and thoughts (which I had never had before) - Took it for 21 days and stopped. Then was put on Effexor XR, got up to 112.5 mg, for about a month, then tried upping it to 150 which resulted in heightened anxiety... so doc brought it back down to 112.5. I've been there 3 more months doing well. Suddenly last week the OCD flared up again, getting guilt about past wrong doings that are old, some going into years. Compulsion telling me to go back and fix the issues... Went to confession and was even told by a priest to let it go and move on. I'm being suffocated by guilt obsession and compulsions to confess and fix old wrong doings. (None are catastrophic or grave.) Now doc is going to discuss Zoloft with me, but I'm super scared that it wont work, or that it;ll give me those horrific intrusive thoughts again.

Any words of advice? I've been taking Ativan as sparingly as possible as I'm scared on dependency, (.25 mg today, .5 mg 3 days ago).. I'm so afraid and no one really understands.