Hi Nymeria,
With regards to your missing nails, I would maybe go to a repitable nail bar and ask for their advice, you may be able to get false nails that can be applied without causing any problems with the growth of your own nails,
I would be careful though not to cause any more damage, or infection, and wonder whether you may be better just trying to put up with it whilst your new nails grow back,
sorry I carnt be of any more help to you, maybe someone else will be able to give you a bit of information from their own experiences,
best wishes, liz xxx