@Wolfcub my sister has an English springer. Beautiful pup with needle teeth who loves to chew and bite too! Though with those ears and puppy dog eyes my heart melts.
@Meloncurse I googled so much in the first week (breathing, hiccups, eating leaves/twigs, biting, hating naps). Anxiety was so bad I stopped eating for 2 days and dry heaved all the time. Very much puppy blues which I googled and read some helpful articles.
Now 2 weeks in I am so much more comfortable (went from a 10/10 to a 6/10 to a 2/10 and now maybe a 1/0.5 for my anxiety). You get used to the breathing, hiccups etc. You see the vet who has seen 1000x nervous puppy owners and reassured from them. And naturally your anxiety cannot stay at 100 all day every day.
It gets better and you know your doing your best. The anxiety and nervousness does pass.