One of the applications I have on my phone is called Daylio. It's a mood tracker and I've used it for 100 days in a row as of today. It is simple and allows you to rate the day using faces and icons for activities. It will back up to Google Drive, too, so I didn't lose anything when I changed phones. I've found that overall I have good days, although today was just 'meh'. Anyway, if this is something you're interested in tracking, I highly recommend it.