Waves to Gigs - sounds like a day of taking it easy and getting your body back in synch is in order Hope the little Gigs have fun at the park - it is a niceish day here too, cold but sunny.
Ginger - they don't give you long to make your decision, but don't feel pressured into anything, you are completely within your rights to ask for a little more time if you want it. Sometimes they make you feel as if it is something you 'ought' to do, but that is nonsense, you are getting through your own illness and treatment, - you aren't guinea pig, so you do what feels right for you.
Amber is great with sciency info. - so hopefully she can explain it all for you, I don't really know anything about the drug you are being offered, but I do know that all the time cancer drugs are becoming more targetted and precise, and that can only be a good thing in terms of effectiveness of treatment and reducing side effects.
And remember chemo affects good cells as well as cancer cells, that is just one of those things with cancer treatment, - but the good cells will grow back, and cancery ones will be zapped. I found this avastin website which looks reasonably sensible. there is quite a good video which explains how avastin works (when you click you get a 'choice of cancers' list
and Ha! but I think whatever you click on you get the same video
It does list a raft of side effects, but not everyone will get all those, if you feel it is making you feel too ill you can stop the trial any time, and many of those side effects are ones you get anyway with chemo (yes they sound vile, but you don't usually get them all, or all at once, and they can always give you something to help with them)
Grr at your brother - sounds as if he needs a kick in the pants to help him understand that you need loads of support atm, not unhelpful buggers.
Smee - beigals and bucks fizz sounds lovely, I will save you a bun
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I have just asked Dh what days he has off over Easter, to which he replied 'I've got today and Easter Monday, but I think I will take Shrove Tuesday off as well' 

