Elaine
You can appeal to the Upper Tier Tribunal but not because you disagree with the Decision, only because you can show that there was Error of Law in the making of the Decision.
What is an Error of Law? The first stage to doing this is for you to request a Statement of Reasons from the Judge that heard your appeal.
Tribunals – Requesting a Statement of Reasons You can also make a new claim for PIP, there is no waiting period.
Gordon