I must be doing something wrong.

What you say is called sweating and it's categorized under coaching afaic.

Can you post graphs ?

$EV/100bb tells alot about how you're doing at the stakes

Do you have holdem manager? do you watch a video after every session? also reviewing the hands you played and taking notes on the players. Consider it a long term process almost no one is instantly good at poker. There is no shame in moving down playing under rolled is very tilting because everything matters too much. Also you focus maybe too much on what you made one day to the other (easy to say) instead you should look at your play and see if you made mistakes.
Edit: I see you say you are getting coolered that could be so but you probably have other leaks that you are unaware of

If you make a little video of yourself playing 4-6 tables I wouldn't mind going over it.

@atlih007: i am currently using pokertracker and i'm like 9 BI under EV. however, I don't think that tells the story because I seem to get a lot of AA or KK and someone always calls my 3bet with a underpair and flops a set. Usually goes like this: 3 bet pfr, villain calls. something like 265 rainbow, I bet close to pot, he just flats, -> turn reraise and i'm like wtf do i do here. or they just raise it on the flop and there's a flush draw out there too, and it's always a fucking set. in those situations, your all-in EV on flop would be bad so the graph doesn't reflect the shittiness of the situation.

Same with when it seems like flush draws always hit against me in non-all in situations.

@edzwoo: cool, i'll look into using camtasia