Laura, there was another Micajah Lindsey in Alabama, who lived in St Clair County. Perhaps he is the one who died in the Civil War? I don't know much about him, although I did find land records in the St Clair County courthouse. As far as I can determine, he wasn't related to "my" Micajah.
Do you have any male Lindsey relatives? If so, a DNA test could prove helpful. See the Lindsay International website at www.clanlindsay.com
for more information.