Here are a few links about it:

http://www.cosmosmagazine.com/news/2...gly-unreliable

http://www.nytimes.com/2011/11/29/he...pagewanted=all

http://m.guardiannews.com/lifeandsty...e&type=article

http://www.nsf.gov/news/news_summ.jsp?cntn_id=117140

As for a medication, I'm not really sure what you're asking about in regard to memory. If it's that in your heart you know you didn't do something, but your thoughts don't match up with what you know in your heart to be true, and it is bothering you, I think this is something a therapist could help you with.

At the very least they should be able to reassure you that most people mis-remember some events and circumstances at times. In some of the articles it even discusses experiments conducted where people, if shown a picture of an activity they had never done, or asked if they recalled seeing news footage that in reality did not exist, said they remembered doing the activity, even adding details. The same was true of the non-existent news footage - a great deal of people "remembered" seeing the footage!

If you google "unreliability of memory" you'll find a lot more too.

Best of luck to you.