I would echo every thing that has been said before Kirsty... Call the Bariatric Team tomorrow & insist on an immediate appointment, If still no joy then at least ask GP's advice... but you MUST seek mediacl advice urgently...
I was warned by GP that some do get the Blues a few months after surgery, especially if your experience was traumatic, mine experience was too... so I know how you feel.
But the sickness isn't right & needs sorting... Even if the Blues continue, there is no harm in mentioning this to GP too.
Kirsty I hope you get some help soon,
But know everyone is thinking of you...
Hope you feel better soon.