Trying not to sound "holier than thou" but I can't remember feeling temptation to stray away.
I tend to find that when you are getting pasted badly, simply finish said game, save and exit.
Go and do something else.
I guarantee that soon enough you will have that old feeling come back to you - 'Right, this time it will be different, I can't be as bad!'
With realistic loans I agree with Jimbokav1971 - many a time have my teams been pulled apart by a Championship striker.
However, I would not underestimate the player's will to play first team football. Quite a few real players in Leagues 1 and 2 have had short loan spells in non-league, particuarly at the beginning of their careers.