Hi Deb,
I could tell you not to worry about it, forget about it until next Monday and just get it over and done with when the day comes. But I guess if we could all think logically like that then half of us wouldn't be on this forum
But look, you had a mammogram a year ago and presumably you got the all clear then. A doctor once told me that mammos can pick up changes about 12 months before a lump is even felt. So they pick things up very very early.
So even if the worst did happen on Monday (and I'm not suggesting for a minute that it will), you know it will be something that was caught very early. So it's definitely best to get it done.
Because you had breast cancer before then it's obvious your anxiety is going to be high at the moment. Be kind to yourself and I would say to allow yourself some little bit of anxiety rather than try to completely get rid of it. Try to distract yourself as best you can between now and then. If you have to, pick a worry time period each day and try to postpone your worry until that time. I do this sometimes and if I'm able to do it it's a brilliant technique.
I really hope everything goes well for you on Monday, and there's no reason it won't. Keeping everything crossed for you