Hello, I need some advice on my situation.

I was married in 2002 ( our son was born 2001) we applied I-130 AND I-485 in 2002. I already had my biometrics and interview in 2004. I since moved out of New York to CT and transferred my case over. My husband and I have now separated (not legally) still married.
DHS sent me another fingerprinting appt in which i went to and has now sent me for another interview next month(Sept)
My questions are...
How many times do i need to get fingerprinted and interviewed?
I've done this last year in Long Ilsand City,NY ( i have all paper work showing i did this already)

Should i bother going into this interview since I'm now separated (for 5 months)? And if so, will i get into problems? We are still married and have a 4 yr old son together. We dont know if we will get back together ...

And if not, what are my next options to stay here legally with my child? can they deport me with my US born son if i withdraw my application?

Please help since my interview is in 2 weeks.
Thank you