Your baby is obviously very sensitive to sound. This is not uncommon and is known by the medical term 'hyperacusis'. These days children with this sound sensitivity are often labelled as being 'sensory defensive' An OT would be the best expert to consult to assist with helping your baby in this regard.Later it may be necessary for him to be seen by a child psychologist, but this depends on his progress.
As regards your new nanny, obviously he has not bonded with her yet. He is missing you a great deal and can almost be regarded as showing signs of separation anxiety, despite being so young.He should improve slowly with a great deal of patience on your part and on your nanny's part.
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