will i go to prison ?

i have been in receipt of PIp for 4 years after ny pain clinic advised it. I have several conditions - I’ve had spine operations twice to kill nerves on facet joints to stop pain of disintegrating joints.  I had a disasterous stomach operation which caused me to get Fibromyalgia and diverticulitis which then brought about chronic pain syndrome .  I also now have arthritis and other conditions caused by the bad operation.  My facet joints are still disintegrating but no more can be done. i also now have severe depression and anxiety .  However prior to all this i ran successful nightclubs etc . Going from a successful and amazing life to this has been awful and i tried to hide how bad i felt from the world .  Long story shortened - i was awarded full PIP by several different assessors over the years .  They now say - because someone reported me for not being disabled and they the dwp videod me secretely and saw me once going through drive thru, and also i took on lease for pub and put in manager so i would have an interest in that industry which i did for 33 years - they say i am not entitled to pip - are coming to take car next week, and possibly doing me for fraud for 4 years ????   I haven’t lied - i have these illnesses but i do have days (maybe 3 a month ) that if i take enough meds etc i can act normal - ish .  I am a expert hider of pain as i feel a failure -  am i going to prison for fraud ??   i’m terrified , i’ve not got out of bed since nov and i don’t know what to do anymore . They are coming on thursday to discuss the pip overpayment - but i am entitled to it ???  my brain won’t allow me to go over the bundles of paperwork they’ve sent - so it’s sll going against me .