Driftwood, - I'm also really sorry that your DX has been confirmed. You will feel in a state of shock, and feel frightened - that's perfectly natural.
I'm glad your mum knows, - its always hard telling loved ones, and she will be able to support you.
Like you I was 48 when I was DX, and have been on tamoxifen for 2 years. I am menopausal, but it hasn't been too bad. Everyone is different and I know lots of people who have virtually no side effects from tamox. and others with only mild ones.
I agree with Cakes, definitely discuss with your BCN the problems over attending your appointments. There may be some sort of hospital accomodation or transport available to you, or a local cancer support centre that can help. Macmillan can also be pretty good with practical help.
Take a few days to get yourself back on an even keel, come on and chat if you think we can help. Its a bastard of an illness, and knocks you for six when you find out you have it, but your DX is the first step towards your recovery, and once you know your treatment plan, it does all start to feel a bit more manageable. xx