First off, let me apologise if I've posted this in the wrong forum section. I think I've chosen correctly, but I'm not entirely sure!

Anyway, I'm an EU national and I had my NINO interview two days ago. I submitted my passport and told the interviewer I was staying with my partner at the hospital residences where she currently lives in, and that we're on the lookout for a flat. When asked why I wanted an insurance number, I replied I wanted one so that I could start working. Then he asked me if I had been applying for jobs, to which I replied I wanted to sort out my living situation and paperwork before going on a job hunt, and that I had enough savings to tide me over for quite some time, therefore wasn't worried.
The interviewer wasn't particularly impressed with my responses, and he started grilling me on all matters of things. I was getting extremely nervous by then, and when asked by specific dates of travel to the UK I couldn't really recall anything aside vague months (I've came to the UK to visit my gf a lot of weekends in the past two years or so). He then asked me the address where I'm staying, and when I couldn't cite it by heart he told me it was all very suspicious, that I couldn't tell him specific dates of travel or the address. When pressured, I gave him some dates which I think reflected the times I've visited here, but I'm not entirely sure.
In the end, he wrote at the back of the form that I hadn't applied for any jobs, and that I wouldn't until I got my NINO. He told me that since that was the truth, I should be okay with signing it. It is the truth, so I signed it...but I couldn't help but feel that the whole thing was designed to back me into a corner, so that I'd sign something that would look bad on my file.
Now, here I am: about to sign a contract for a house in two weeks or so, ready to buy everything I need to reside here for the longterm (and burn through a fair ammount of my savings to do so)...and extremely worried that I'm going to have my NINO refused (either because I haven't been looking for a job, or perhaps because I gave the interview wrong dates of my travels).
I'm super anxious about the whole thing, and the interviewer told me I should hear from them in about two months. Am I just being paranoid and this is entirely normal...or am I right to be concerned? I feel like I have my back against the wall, honestly. I can't help but think I'll get a refusal letter once I'm my new house, after spending a lot of money, and that I'll have to consider leaving the UK.
I'm extremely sorry for the long winded post, but I'm just so anxious about the whole thing that I'm even having a hard time sleeping.

Thank you so much for anyone kind enough to reply!