Hi molehill, im sorry to hear you arr so anxious and worried andi can understand that yui want to know more about your family history.
Howvere, adoption records, much like medical records, are confidential.court records too are sealed for 60 years.
Adoptees have the right to infornation about their birth families but this right is not reciprocal. You have no right to any details about your brothers adoption, such as his new name .Im sure you will understdn this is to protect adoptees rights and privacy.
So if you want to discover the circumstances surrounding your bothers afoption you will need to ask your parents or other friends and family who might be willimg to tell you.
If you wish to trace your brother, you can use the adoption contcat registers for the country in which the adoption took place
You can, as lou suggests, contcat your local social services, but they may not be teh relevant agency. There were many voluntary agencies who also placed children, so you shoudl contact any which operated then. If they have since closed, their records should have been kept by anther agwncy or SS. Im unsure what information they will be able to give you, without your parenst and your brothers consent.
Im sure you wil want to discuss witn your counsellor if you want to go ahead with such a search. It can be very difficult and painful for everyone concerned.
I hope you can find a way forward that helps you with your distressing feelings