Call in a reputable local builder to fit temporary support and investigate as a matter of urgency. No use asking questions on the internet if your ceiling is about to come down. If it was a supporting wall there is every chance of the whole thing coming down.
If you want to carry out work yourself , hire out acroprops and support area you think is load bearing. Cut plasterboard (after supported ) and you will see if joists are supported properly. Alternatively get inspected by building control / structural engineer
Nick shares his story of finding local tradespeople in his new area.
