My Company forced me to take a unpaid leave because of back injury

My job title was flight attendant but for the last 5 years I've worked a desk job because of a back injury. I've now been told I have to be on long term leave because I cannot physically do the duties of a flight attendant, even though the job I've been doing for 5 years had nothing to do with that. I've applied for unemployment but was denied because I'm on long term medical leave even though my doctor wrote a letter stating I was able to do a desk job. I requested an accommodation formally under the ADA to be allowed to continue to do the job and I was denied. I'm now sitting here with no income, no unemployment and I have no idea what to do.