I have to say, Jan, I'm shocked that your GP left you hanging like that. It sounds like there is a very good chance your lump is something like a benign lipoma but you need to be told by someone who knows! You need to know where you go from here, what to expect and what to look out for and if it was me I would be wanting to hear that from the breast clinic, not from my GP.
Maybe my situation was different because at the first appointment I was already warned it would most likely be cancer but there was never any question of anything other than a face to face consultation to receive results. You need to see someone to put your mind at rest.