It sounds like there's more going on than just accidentally deleting your typing.
The Apple shop might be able to help - you know you have to make an appointment, don't you? So it might be worth trying the helpline first.
I feel for you - my last Mac died suddenly on me and the faulty part (which had been replaced before) was no longer available. DH kindly bought me a new one..... he volunteered straight away and I nearly fainted from the shock of him spending money.
Prayer ban at Katharine Birbalsingh’s school is lawful, High Court rules .
To think that London, or anywhere else for that matter, does not belong to any one demographic