This is exactly the feeling you would have but mate I would advise you not to sell. infact if your in the position to buy more I will prefer you buy more and hold them this is the last time in this year Ethereum will dip and if you hold for longer term you would be in the best profit.

Eth will grow for sure it's just FOMO that is your problem at this point but don't follow the crowd to sell but instead be amongst the few that will buy now.