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Welcome to the forum, you might want to have a look at the following FAQ which explains where everything is
Welcome to Benefits and Work In case you are not aware, your real name appears to be showing in the forum, if you want to change this then follow the instructions in the following FAQ
My full name is showing, how can I stop it?
A new diagnosis does not necessarily mean that you will score higher.
Do you understand how the assessor marked you?
Can you reasonably explain how you now meet the criteria for a higher award?
Notifying the DWP of a Change will result in a new PIP2 being issued and almost certainly another face to face assessment, the new Decision will supersede your existing award whatever the result might be.
If you do notify the DWP then do so in writing and use a Tracked post so you have proof of delivery, the date of your letter should be used for the start date of any new award.
Gordon