Barneybear
Have you sought permission from the DWP to be out of the country for periods in excess of 13 weeks?
If you have not then your problems may extend beyond having to claim PIP. See
www.gov.uk/claim-benefits-abroad/illness...-disability-benefits This is not a matter that we can easily help you with on the forum and my best advice is that you get face to face advice from a trained advisor, do an internet search for "welfare advice" with your postcode, town or county.
Gordon