LOL @ Open Mind.
OOdad is right. Anger is normal. Get it all out here, and keep from doing anything stupid. I still can't seem to stop doing stupid things, but so far, nothing has stuck.
I would just be honest with them here. You no longer wish to serve, and you need to give some attention to your health. Thank you, come again.
Try it. The simplicity is great. Don't be ashamed, don't write a lettter (paper trails are NEVER a good idea), just pull someone in the back. BTW, you should have told the others about the sex offender whos house they were being invited to. Its public information and they have a right to know. An elder telling you not to, is actually commiting an illegal act. Just an FYI.
You: Hey brother givesmelotsawork, you have a sec?
Bro: Sure after I am done walking around looking busy during the meeting because I'm important. Ok now what was that young padowan?
You: Just wanted to let you know, I have decided for now it would be best if I stepped down. I also would like to take care of my health which has been deteriorating.
Bro: Well perhaps if you prayed more and stopped masturbating like we discussed last week but forgave you on.
You: Yeah, i have prayed about it, and I am convinced this is the right thing for me to do. Thanks again. I look forward to serving with you again sometime.
Bro: Harumph, harumph.
You: (silently) whew!