Worried sick!

Hello all, first time posting here I found a lump in my right breast upper outside quite big oval shape I went to the Dr an Dr she thinks it's a fibroadenoma or a fat necrosis her words were I'm not worried about that at all but she referred me I have an appointment next week I can't believe the anxiety I feel waiting for this appointment I recently lost my dad to throat cancer and I'm sure that's making it worse when I first found this lump it was so big I could see it without even touching it but it has gone down but now I have some pain in my armpit and underneath my collarbone but no lumps I've googled so much and as helpful as it is I'd rather talk to someone else I dunno the point of this post just really to talk to people who have been or are going through this