I want to find my birth mother?

My twin brother who has cerebral palsy and I were adopted 21 years ago from The Children's Home's Society in jacksonville,fl. I would like to find my birth mother because the adoption agencyy wont give me any info. I was born on october 21,1986 and was 3 1/2 months premature with a heartmurmurr. After I was well my birth mother came and took me home with her only to bring me back to the adoption agency saying she didn't want me. She never asked about my twin who had died on the operatingTablel twice. The main reason I want to find her isbecausee I want myfamily'ss medical history I do not know what runs in my family. If anyone knows of a woman who had twins early and gave them up in october of 1986pleasee let me know. or if anyone knows of a way I can get my records please help