So sorry about your Mum's friend Sometimes, - it is sad for you and to see your mum sad as well. Getting out of the house is always a good therapy I find for most things, - whether shopping or just pottering about. xx
Lime - very wise to assign entertainment to your DH
- my DH used to run of an hide at the mention of large groups of children!
What is this sun thing of which you speak Smee? Send some upwards and eastwards please 
I've heard lots of good things about acupuncture, am sure it is very helpful.
Reiki - the sceptical side of me says there is no logic behind it, and no reason why it should work. But I know several people who swear by it and seem to get benefit, and my yoga teacher does a bit of it and has used it on my shoulder before now - I can definitely feel a sense of calm ad warmth when she does.
Whether it's in my head or not I don't know, but actually it doesn't matter - it can't do any harm, and if you feel something helps, then it works for you.
We can get reiki for free at our cancer support centre (plus a range of other complementary treatments) - and I know people really feel better and calmer after them.