I use an ap for my iPhone called T2 mood tracker
Don’t be put off by the title ...it was originally developed to track mood after brain injury but the app allows you to fully customise your symptoms with sliding scales. I don’t use any of the preset ones. You can also group symptoms under one header symptom ...like cognition (see example above)
The app graphs symptoms as you go so you can look at what your symptoms were over different time periods up to a year. You can also add notes.
The above is an example.
I’ve been using it for a few years and over that time I’ve tweaked the symptoms I track based on correlations I’ve noticed. For me I track
Heart palpitations
PEM
Muscle weakness
Cognition
GI symptoms
Mouth ulcers (that’s mainly because I have a folate problem)
Infections
Allergy/histamine symptoms
Pain
Temperature control
Beneath these are sub symptoms so allergy would have hives, wheezy, itchy eyes...it then averages these and graphs the summary of those symptoms or you can look at them graphed individually/. I fill it in at the end of the day and it takes me less than a minute to do since even for the cognitively challenged (me most evenings) it’s quite straightforward.
It now can sync with Fitbit so you can view steps alongside the symptoms which helps ....I believe it comes in apple or android versions.
This is my second most useful app on my phone for pacing/working out triggers/clusters of symptoms.
I’m sure other apps are available ...I just have stuck with this one because it works for me.