TL;DR

Read anyways... You are in the wrong forum! You've been lurking for 2 years but didn't know this? Go here: http://www.flopturnriver.com/phpBB2/...circle-f4.html and read all the stickies. ESPECIALLY the Bankroll Management threads. $25 SNG games are too high for a $500 BR, you'll need to move DOWN! And you are playing HU? Talk about variance. If you can learn to think in BBs instead of $$s then you may be able to get back to where you were.

To be perfectly honest, you sound like a gambler more than a poker player.

Everybody goes through swings, that's what a BR is for. It's the cushion that gets you past those swings, but doesn't force you to change levels. GL!