This is interesting? Do you have any other sources of caffeine in your diet? For instance I would have a regular can of coke maybe once a week and English breakfast tea at least once a day. Only coffee seems to really affect me though. I don't really need the affect but I do like the taste and now probably have 3 or 4 coffees a week rather than 2 a day and it seems to be helping.
No more getting anxious and worked up about small things and picking fights with my partner.
When you are trying to have none, it's suddenly everywhere and in your face without realising it.