OMG - you made a woman go up in the loft and now shes fractured her skull??? Crickey you should feel SOOOOO guilty! How can you live with yourself? Nothing short of a REALLY EXPENSIVE present would make up for that kind of ...well... is virtually wife beating isnt it.
May I suggest:
A week of you doing the cooking, washing and ironing, followed by a FULL week of meals out at really decent restaurants (no, MacDonalds will NOT do). Then a spa weekend away for her (you will be doing the ironing so you cant go) - I suggest Aqua Sana (www.AquaSana.co.uk). That should take you up to Christmas, at which time you can go for a case of therapeutic champagne and maybe a theatre trip.
I cant see any other way you can expunge your guilt on this one.
Oh, and get well soon Megan!