I don't understand how Aetna can do this. I'm scared!!!

I was on disability and approved for short term disability by Aetna for five months for a diagnosis of severe MDD and PTSD. I have severe anxiety attacks and panic attacks. I don’t sleep at night. I cry all the time and can’t think or function to even take care of myself. I’ve been with a psychiatrist and in therapy and have been faithful to my treatment. I was even diagnosed the same with my primary. I went back to work. A month later, I fell again. It is even worst now. Aetna still hasn’t approved my claim and I haven’t been paid. I have had to take a loan on my 401k just to make some of my bills. I’m scared!!!!!! The psychiatrist office provided them plenty of clinical notes and documentation and I was approved before so it is not like this isn’t a viable claim. I haven’t gotten a call. I received a denial letter once and then told they would expedite my claim once they received the paperwork. They got the paperwork and confirmed it with me on 10/1/15. This is 10/8/15 and I have not heard back after several calls and emails. I have to have money to pay for my medicine so I can be healthy. I’m having worst stress and anxiety over this than I had so I’m getting worst. I’m even on a contract for safety. I don’t understand how they can do this? I’m scared.