And since you are a logical person, here's a (partly) logical advice -
Take a break. Go on a vacation, or even better, go on exploring. Its highly likely that you'll gain new perspective (followed by seeing new opportunities, and new interest).
Don't leave the job unless you have a better option.
I disagree that suicide is illogical. There is nothing logical about a desire to continue existing. Logic simply has no bearing on such decisions.
This is why irrational drives are essential. Down there at the bottom of whatever logical structure you have built sits an irrational longing, desire or passion which keeps you going. For the OP it was a family and a drive for successful reproduction. It can be other things, too. Without a drive like this giving you a purpose, logic won't prevent you from self-destruction.
I agree that what drives us is a desire/passion seated deep within ourselves, but I wouldn't say it is irrational. Also, exposure to new environment can very well influence it.
That is the context in which I called it an 'illogical' option, as it would be more logical to explore other options, gains new experiences before committing oneself to the option of suicide, the option which is pretty much an end of road in itself.
While on the other hand, taking other road can kindle some new desire, and help give a new meaning to one's life, or give new perspectives, ultimately enabling one to achieve the original longings.
And since you are a logical person, here's a (partly) logical advice - Take a break. Go on a vacation, or even better, go on exploring. Its highly likely that you'll gain new perspective (followed by seeing new opportunities, and new interest).
Don't leave the job unless you have a better option.