People sell but the price goes up 
Cmon did one mistake by selling yesterday, can we please go back to 800 for a second

Cmon did one mistake by selling yesterday, can we please go back to 800 for a second

if we did, you'd think "why buy now? It'll go lower"
Probably

But really, I regret it so much (again) that I speculated (once again wrong) and sold, even though I tell my self I will hold forever.
I've been there. The worst type of sell is the "damn, i could have sold at the top but didnt, lets sell now and hope it goes down"
Well, if you missed 1200, sold at 900 and bought at 550, then you are doing ok. However, the statement above holds in 99% of cases.
Now, I bought on Bitstamp at 890, should I sell now at 860, to re-buy back at 800?

Yeah, yesterday I sold @780 because I thought it is a top, then it went down to 770 and started to go up and I thought: hmm buy back @800? No itīll go down, buy back @820? No itīll go down, buy back @840? No... 860? No...
You really deserve it. Sorry.