SVX in pain

[Urabus]

When I start my car there's smoke coming out of the back just off the startup, the engine light is on... and my idle has been rough for a couple of weeks.. (My fuel pump connection isn't the best figured the idle was messed up due to a short on the fuel pump)

Some people are telling me I have a blown head gasket... I was loosing oil about 3-4 months ago When I was 'cleaning the carbon' out of the engine on the highway and since then it stopped leaking oil.. After another oil change i figured that the oil filter must of been slightly loose and thats why I might have been loosing oil..

the smoke is slightly blue mostly white. Contemplating taking it to the subaru dealer.

I was told the TPS sensor was dirty or shot a few weeks back either that or an O2 sensor was shot due to having the check engine light on for a few weeks now.. But now Im seeing big puffs of smoke comming out of the tail pipe

Should I stop driving my car? Any suggestions on what to do before I ruin my engine?

Thanks.