Since you don't have backup , try to repair the database,

TRY

ALTER DATABASE corrupted_db SET SINGLE_USER WITH ROLLBACK IMMEDIATE

DBCC ChECKDB ('corrupted_db', REPAIR_ALLOW_DATA_LOSS)

ALTER DATABASE corrupted_db SET MULTI_USER

CAUTION : There is a high chance of data loss

If you mange to get database online, make sure you implement database backup strategy