Creating a Journal for PIP supporting evidence

I’m sorry for being a nuisance,  I  need to provide supporting evidence with my pip claim.

I was told to create a daily journal (how my mental illness effects me in a day to day basis - depression and anxiety) 

I feel really overwhelmed right now, I’m not even sure how to start or go about it, are there any help online, a template I can use perhaps ?  Any websites I can go to and use , a template would be helpful to be honest. 

Please if anyone can help me I’d really appreciate it . 

Many thanks,