Hi Sam,
As far as the UC Migration is concerned I would have a read of this members post regarding the Citizens Advice Help to Claim service
www.benefitsandwork.co.uk/kunena/10-dla-...aged-migration-to-uc The Help to Claim phone number should be on page 2 of your UC Migration letter.
I understand that bipolar disorder can affect your concentration and the meds can cause tiredness. So if possible I think you should get personal assistance filling in the PIP review form. Are you aware of any Advice agencies in your area that could assist with the form?
David