Hi Sarah
I sometimes feel a bit the same as you..
I was also DX nearly 4 years ago and apart from the lump which i found, i could not have felt better!
I guess if (and god forbid i hope it does not) a recurrance or a new primary does emerge, then we will find another lump (or something which indicates that all is not well?)
Anything more than this, i would hope some symptoms would appear, which would ring alarm bells.
Right now, we have to live with hope and take each day as it comes (that is my mantra anyway :-))
Wishing you many years of health and happiness.
Naz xxx