Tater cate,
it's pretty likely your itch is due to Remeron withdrawal. Search online for "remeron withdrawal symptoms itch". I believe you will kinda need to go through it somehow and itch will stop with the time.
Besides Benadryl, this can help a bit:
- avoiding heat sources, hot showers...and applyinig cold wet compresses
- avoiding painkillers of any type if possible. Pain and itch exclude each other, so painkillers may aggravate itch
- avoiding scratching or avoiding scratching with nails, but rather massaging the area with hands (I know...)