Hi, it's a myth that nappy rash is caused by teething :shock: I know, I was surprised too
Owen went off his food when he cut his first teeth too but I think it bothered me more than him. Try to relax about it (easier said than done) and your baby will be make up for it. I gave infant paracetamol when the teething pain was bad. I'm in the UK and it's called Calpol. I'm sure you have something similar.
Last but not least, this difficult stage will pass