What a wonderful partner you are. I can only relate to my own experience. I wanted to know what the lump was, yes it was scary but i always knew i was doing the right thing, since then i have found out that i will be fine.....there are so many types of lumps, who's to presume the worst!
I suggest going to the doctor to have it checked out or call the mcgrath foundation and speak to someone about your situation. Putting fears aside must be far better than living in the space you are in currently.
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Cheers and good luck, Janet