Well 3k is not bad at all. don't feel so bad about it. some of us in early times were sold their btc at lower price before the epic bull run.
events like this have often happened and this is a loss for traders who can not control their patience so make a mistake like this, so waiting until the price rises again is the right choice to be able to get a lot of profit.
if you think that is mistake think again mate you didn't read the OP at all. the reason why he sold his bitcoin to such a low price he needs the money to feed his family i don't think that is a mistake at all.
Dude how much do your family eat? Do they eat 6k$ worth of food and stuff? You could have sold some of it , you didn't have to sell it all so your argument is void.
I spent some at the beginning of the year instead of waiting and I was also forced to spend some on living costs which pissed me off.
Sometimes people hides some personal issues between him and his family and also, do you think food is only thing that family needs? i don't think so and besides, 6k usd isn't huge money if he's living in US or UK you know but in my country that is huge you could feed 1 family for 3 years!!