Just had to add a welcome to your post - especially as I can see you posted early morning probably awake from the steroids! I've been away recently so not been posting much but just wanted to say that all of us on the secondaries part of the forum understand exactly how you are feeling. I was dx with bone mets nearly 5 years after my primary so it was a real shock, especially as I'd had no symptoms whatsoever. I had FEC chemo followed by hormone treatment, this was in 2008. After nearly 5 years my mets went to my liver, this was 3 years ago and after a bit of a roller coaster ride I am now doing well with all bone mets stable and liver mets disappearing. I am also on the combination that you are on, although finished the chemo part in Dec 2014. As an abbreviation some of us shorten the Herceptin and Pertuzamab bit to 'H and P'. There is a thread on here called Pertuzamab and you will see there are a few ladies on it, all doing very well, but a bit further on from where you are as we have all finished the chemo part. I will 'bump' the thread up so you can see it more easily and have a read, it may help with coping with what we all know is a massive shock.
There is a very popular thread on here called Bone mets please join in and is used by many ladies even if they don't have bone mets. There is continued support on ere and you will see you're not alone!
Do come back to ask questions, get support or just have a rant!
ps btw I used to suffer with the steroid downer, so hang in there, it does get better.