5 months ago I completely changed job and moved house after my relationship almost broke down. I was also going through a cancer diagnosis. I forgot to tell tax credits about my change in circumstances - I had an employment gap of about 6 weeks - and my income went up. I’m on the phone now on hold waiting to beg for forgiveness/ offer to pay any overpayment back. But I’m really worried about it. How much trouble could I be in?