iphone 5s back camera malfunctioning

I realized my rear camera was not working yesterday at about 11pm and immediately I thought it was a software update problem because I was still on 8.4. So I went ahead and updated to 8.4.1 but my camera is still not working. After a few research, I realized this was an on going problem with apple. I have tried all the solutions from similar questions but my rear camera is still not working. My front camera works just fine. How do I fix this problem? I can't even afford a replacement.