awesome replies guys, very interesting and reasuring. Similar to poor dalecooper I think I was unlucky enough to hit my first MAJOR bad streak while moving up a level - from .1/.2 to .15/.30 nl and losing about 6 buy-ins over approx 2k hands, getting everything cracked and nothing going right. There were other factors:

The play was different and it took me along time to realise this - players were alot looser and my continuation bets didnt work nowhere nearly as much as at the level below.

The added psychological hinder of my BR dropping below 1k was noticable and may of also effected my play. I also had to cashout $800 very soon to pay rent so it wasnt a 'true' playable BR really.

Since then I have dropped back to .1/.2, got back into the swing of things and cashed out my 800 with 446 now left to carry on building my BR with at .1/.2. When I get 1k or maybe 1.5k of true playable BR [where nothing has to come out for rent or bills!] ill try moving up again to .15/.3 [$30 buyin] 6max nl.

I've now started compiling my daily sessions into Excel so I can generate graphs like CocoBills - I think it will be very usefull to look at when you feel yourself tilting a little and overall just very satisfying to look at!

I now have Poker Tracker but need to ring up my poker-room to sort out them compiling my past hand histories and email them to me as their software service is rubbish - only allowing me download the last days HH's. I must have anything from 15-25k hands and cant wait to start analysing them!