Here's some that might work -
http://www.vitalmhealth.com/painmonitor/
http://www.webmd.com/webmdpaincoachapp
http://www.androidapps.com/health/ar...e-android-apps

There Are 41 Very Unsafe Android Apps Out There
http://www.theatlanticwire.com/techn...t-there/58190/

I'm sure there are more out there...

Do you have Google voice , voice recording, sticky notes?
any of those would work to quickly make a note of pain, symptoms.