No walker? I guess you graduated. You make it sound like you're "House MD".
If need be, you could reasonably add Xeloda to Navelbine. Maybe some Femara as well, since having Herceptin may have bosted the "weak" ER side of things. Could also go for a Her 2 blockade by adding Lapatinib. Might be worth asking for a serum her2 level and cell search to get a view on things.
Navelbine (w/Traz, liver friendly, w/Cap)
http://her2support.org/vbulletin/showthread.php?t=42261
Letrozole
(monotherapy, with chemo, w/Sorafenib, in er-, immuno-synergy, on-off strategy resensitizes)
http://her2support.org/vbulletin/showthread.php?t=43285
ER/Her2 crosstalk (combination therapies etc):
http://her2support.org/vbulletin/showthread.php?t=38998
Lapatinib/Herceptin combination (Her-blockade, Lap passes BBB)
http://her2support.org/vbulletin/showthread.php?t=41397
Circulating Tumor cell test (interpreting, vs marrow)
http://her2support.org/vbulletin/showthread.php?t=41709