I’m sorry to hear about the problems you’ve been having with PIP. It sounds like a really stressful time for you.
Unfortunately, PIP reviews and reassessments from the DWP can take place at any time. There’s more information about PIP reviews on the Turn2Us website which you might find interesting.
The Government has also recently announced that they plan to end PIP reviews for people with the most severe health conditions, and publish more information this summer. While there has yet to be an update, our benefits advisors wrote more about the plans in another discussion on the community which may be of interest to you.