Am i entitled to back dated esa?

Hi, i would appreciate any response on this.
I was on esa before all this happened. they sent me a medical assessment appointment in which i didn't receive back in February this year.
I responded to there letter asking why i didn't attend saying i didn't receive the appointment letter, in which they sent a letter back saying they decided to stop my benefit and decided i was fit for work.

Im clearly not as i suffer with depression and anxiety and dont leave the house alone and wouldn't even get dressed or washed everyday if it wasn't for my carer. I have appealed against them stopping my benefit and had to wait until june 27th 2013 for my next atos appointment which i attended.
The dwp came back today and said i have scored no points so have been refused. And would have to wait to receive it through the post before i can appeal that descision.
I have not had any esa in this whole period and have been surviving purely of my dla of 84 pounds every 4weeks which is very hard when you live alone and have to pay rent and council tax and living expenses.
I am going to appeal again and ask them to look again at the decision as my doctor i see every week says im not fit for work how can some one you see 1ce for 20 mins say you are? if i was to be accepted would i be entitled to backdate it from when i logged my 1st appeal back in February?
Im worried my housing benefit wont be paid and i wont have the money to pay it.

Sorry about the long post its my 1st time i really hope someone has some information.

Thanks

I have written to my local mp to help me aswell.