Citizenship

Hello Everyone;
I need help with what I'm going through now!...I had my interview on Sep-14-2015 in Irving, Texas office.. I passed the interview but I got A decision can't be made! Due to my name that was written on my application so in my Green card my last name has space and on my SSN my last name has a Dash! I wrote my name on N400 application exactly how it appears on my GR! But the IO was'nt happy about it and said my name needs to match my SSN and my GR which is my SSN has my four full name and My GR has only three names which is my first and middle and last name. Long story short I asked for name change and IO said it's going to delay my application and advice not to change it!! So I didn't say anything and he wrote my name the way he thought it should be and to be honest I didn't argue because I just want to finish the interview, After we finished the interview I asked him how long it's going to take for my application to progress he made a funny face and said I don't know maybe a three months and maybe six months!! I said thank you and I left.. After waiting for 65 days after interview I called the USCIS and spoke to 2 tier officer to ask about my case status because my online status still shows (My interview was scheduled) ..The officer told me your case status is Pending!! I asked her what does That mean ? And she replied it means there is no update about your case and they have nothing for you!!!
Right now I'm worried and miserable don't know what to do or what to think!! Do I have to be worried!! Cause I have clean record and my file was really small??!
If there's anyone can share his/ her thoughts and experiences or knowledge I would really appreciate it if you share it with me!! Seriously I'm really depressed ????
By the way I applied for citizenship on July-10-2015

Thanks everyone one????