Larry's Oxygen Machine!

I never thought the day would come that I would have to do this, but sometimes life throws you a curve. Most of my friends know I have been in failing health for the past two years. I am an oxygen at night and dialysis three days a week. Since I was already on Social Security they will not allow me to draw disability benefits. I have applied for Medical supplemental insurance to help with my medical costs, as of yet I have not been approved.. My real problem is I have less than 60 days until Medicare will no longer pay for my oxygen concentrator , after that I will not be eligible until two years pass. I now was tested and was told I would need oxygen in the day time as well. When I was tested this past week my oxygen level went from 98% to 84% after walking for only 75 feet. I need help to buy my own concentrator which will work day and night. The cost of these are 3,500 and I cannot afford it now. Any help you can give me would be appreciated. 
Thanks Larry