I had the same problem. NSO and Marsch denied me coverage as did several other companies. I had one complaint made to the BON, and was unable to fulfill the required 2 years of OB experience, as I couldn't find a job in OB. I was even certified in inpatient obstetrics, and in fetal monitoring. My past is that of behavioral problems secondary to depression. I have been out of nursing for 6 years, and had surrendered my license. I have had counciling, DBT, anger management, retaken NCLEX, and had signed up for a collegate refresher class. I couldn't get any liability insurance to cover me for as little as 3 weeks while I did clinicals. My school let me take the didactic classes and refunded the amount that I paid for the clinical experience. I felt that I had missed out on the part of the class that I wanted the most, but there wasn't anything I could do.
I wish you the best of luck, and, if you are able to find a company that will insure you, please let us know. There are other nurses in this state with the same problems.