Can father seek to regain child custody lost due to bi polar conditions since he is receiving treatment

lost joint custody unfairly: Last year my husband lost joint custody of his children due to him and his ex being unable to comunicate. Shortly after, we found out that my husband was bi polar and was hospitalized many times for his condition. His doctors feel that he could go bck to court at fight this custody issue since he was not being treated for his illness at the time and has since then started medication and therapy. any advice? - Is this your question? Add additional information