4 mths 2nd Botox

Hi, I am in the Uk and had my second round of Botox 4 months ago with a larger dose as first dose completely wore off after 3 months. I can still burp now after 4 months so has worked better but increasingly having to move head out like a chicken again to get the burps out which is extremely embarrassing! Any tips? Or is this just how it is?!