Antidepressants have some very nasty side-effects including memory loss. Google 'zoloft side-effects, false memories, memory loss' and any other similar terms you can think of to describe what happened to you.

My sister is on an AD and has fugue states where she 'comes to' and doesn't know what she's doing, has lost time, etc., etc. She won't believe me that it's a side-effect of her meds but it is.