I've been out of work since February 2017 and I have not received any benefits other than my doctors bills being paid . I need tot do because I

The reason they aren't paying me for my lost time from work is because after I was injured on February 20,2017 they didn't send me for my pre-accident drug screening until February 24,2017 and because I had taken one of my fiance aderal because I was in so much pain and was all tore up and depressed because I had lost my job.Shouldnt I be paid for my not being able to work because I had to have hernia surgery on February 28,2017.They say they want pay me because I failed my pre-accident drug screening .Thats why I was fired from my job.Shouldnt I be able to do something about that because they didn't send me for the drug screening until 4days later.Shouldnt they of sent me the next day? This injury has caused me a lot of problems and lost time from work.Please tell me what I need to do. I don't see the doc till April 17,2017 and I'm still in a lot of pain.Thank You.