is it advisable to go back to your old job?
It depends on if you were a good employee and if you burned your bridges when you left.
In the 1990's in my fiield (IS/IT) it was so common for employees to go off seeking opportunities elsewhere to return we coined the term boomerang employees to describe them. Unfortunately boomerang employees usually start from ground zero when they return with respect to seniority, benefits, and vacation time.
Depends how well you got along with your old boss.
