PIP - should i wait?

Hello all,
I am procrastinating over applying for PIP. I think I should have done so years ago. I have severe anxiety and depression and my health professional (I am under the care of the hospital team) says I should apply and would support me with a report. I have read the BW supplement guides and have written down how it all affects me and i am also in the process of doing a 2 week diary. I probably stand a chance on the mobility part. Having thought about these things it has brought up other daily living issues. I have balance problems, and suffer migraines. The neurology hospital has wriiten to my gp last week to advise how to treat it.( I had a brain tumour some time ago and I lost sight in one eye). I have yet to ring my gp. I had a hearing test on the high st this week and I have low frequency loss in both ears and was told to talk to my gp as there could be issues in my ear having explained my symptoms. A few years ago the neurology hospital requested I referal for a hearing test to my gp but i did not hear anything and did not want to bother the gp for trival matters. Last year I had my thyroid removed as it was cancerous so I have up and down issues with energy and food, just cant get it right with the homones tablets. My question is should I go ahead and apply rather than wait for the gp to refer me for tests and thereby gather evidence on these other things that have cropped up that I was not aware of. They all contribute to my overall daily living. It is becoming more pressing as I think i ought to do it before any government changes apply. I guess I am trying to avoid having to claim again if i had to add more conditions if i dont tell them in the first place. Thank you for any experienced advice in advance.