The only advice I can offer is to repeat what @borpin (whom we haven’t seen for a few weeks now) usually suggested in these circumstances: use a good mains conditioner. It obviously won’t help you now, but his experience was that it may well save you next time.
It’s worth trying to read the card in another computer. If the damage is to the OS and the data is intact, you should be able to copy the relevant files. You might need @glyn.hudson or @TrystanLea’s help to know which they are and their locations.