I’m not exactly sure what you went thru, but it sounds like you got the shaft. A case for SSDI can be started with medical documentation supporting your disability *once* a worker is placed on long-term disability from short-term disability (usually 120 days). LTD is usually where a injured worker needs assistance.
The US dept of Labor is full of lawyers wanting you to have the proper i’s dotted and T’s crossed. My original dr didn’t understand that.