Employment Based Greencard

Hi Eveyone,
I just want sharing my experience and encourage everyone to keep positive and stronger!
I think no one has bad or worst case than me.
My case details are below:
Start my green card application in Aug.2012.
• PD time: Jan19th.2015
• I-140, I485 was filed at the same time on Mar28th.2016
• USCIS received it on Mar28th.2016
• Got my EAD card too on Apr14th.2017.
• Biometric was done on Apr28th.2016
• 1st inquiry by attorney on Nov21st.2016
• Got the email from USCIS on Dec07th.2016
• Asked my constituency congressman to help on Jan26th.2017
• The Congressman office send an inquiry to USCIS in Jan28th.2017
• USCIS replied "need 30-45 days background check from FBI".

• 2nd inquiry by attorney in Feb07th.2017, USCIS does not reply so far!!
• Congressman office sent an inquiry on Mar09th.2017
• Got the email reply from USCIS on Mar10th.2017. (need 30-60 days background check and backed up)

I have no ideas and run out of whole process just because I have tried all different kind of methods.
Even I checked with my attorney, and he said he does not have any idea to help me this time!!

So sad!!
The only way that I think just keep my fingers crossed and positive.