Hi Lily, take a deep breath. I know full well how hard this is. I could hardly bear to even look at our shared account in the early days. What helped me was to ask a close friend over to my home, someone who is good with practicalities, and asked her to go through things with me. I am capable, it was more of the emotional support. But you might also find a second brain on the matter helpful too. In the early days we are in fight mode, I was flailing around. And I took some blame, which meant I could not see the outrageous injustice of being left with all the responsibility. That is to say, we do not do our best thinking at this time.
Song echoes what my solicitor told me. I need to clarify this myself, but I believe that, if you have a date of separation, any debts accrued after that are not your responsibility. And indeed, any income, say for instance you inherited some money, that would not be shared after separation. Getting written proof of this date could prove useful I suggest. I can't see why NI law would be so different, but I just don't know TBH. Hopefully you now have more detail to ask informed questions of your solicitor.