Hi jinga,

I've never done it for myself although I probably should have after my first head injury.

I figured there would be some ready made journals online so went looking.

There is this one

http://www.headinjury.com/journal.html#chart

http://www.headinjury.com/wellness.html
This one is a "Wellness Chart"

They may be too detailed though.
Trying to find one specific to migraine.
Many of the headache/migraine only ones are very complicated.

This one is a monthly migraine journal though that doesn't look too convoluted.
Migraine Diaries

There are probably more on TBI/PCS sites. If I find any more I'll post them for you here.

take care.