I hope you won't get scared again by whale trading action. Just to make short : Don't get fooled into selling cheap for no reason ! These guys (or this guy) are/is looking to stack up before probable block reward reduction in order to keep a huge ROI. He/she/they push the price down so people lower their sell orders and INSTANT WHALE MOUTH OPENING when his/her/their target price is reached. It may happen again so be ready  to HODL or buy before them so they run out of ammo haha.