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Always everything was good, but since this morning phone can't find my SD card. I really don't know what to do. Tried restarting, taking that card out, connecting to pc to format (also doesn't find card). Help, please?
Easiest thing to do is put another card in,if it reads it then the old card is faulty.
Or if your pc cant read the old card, then it may be faulty,i wouldn't try reformat it just yet, in case it works and all your stuff gets wiped clean
Hi @Foxiara, sorry to hear about this. 
Just as @exsanguinator wrote, if other devices can't find the SD card either, I'm afraid that it does sound like there is something wrong with your SD card.
Do you have another SD card that you can mount in your device and see if the device can recognize that card? That way we can see if there is something wrong with the device, or your old SD card.
Let us know how it goes!