Thank you for your query.
There is no reason to panic.There is a definite mass in the neck that needs to be taken care of.You have not mentioned about the movement of the fingers or the hands on the affected side.If they are unaffected then the fear for nerve injury
is less. The head tilting is probably due to the mass described. It might be a brachial cyst or a cystic hygroma
but that needs investigations for confirmation.All the other things during delivery are normal.There is no measure to decrease the swelling so leave it on the doctors.Hope this answers the query.have a nice day.