Thank you so much for your help, it's been making me so poorly x

Thank you very much

Hello, I was at Sainsbury's pharmacy a few weeks back, whilst there I picked up some washing tablets. Whilst waiting for my medication I recieved a phone call to say to immediately get to the hospital as my dad was in a bad way. I didn't think and just ran out (washing tablets under arm). Did not even think about them, security called me back I explained what had happened, they took me into a room and said I was barred etc. I then paid for my item and left the store. They said no further action I just could not go into any store. Now a couple of weeks ago I recieved a letter from DWF saying I have to pay £150 for security. 6 days later I recieved another one basically saying I would end up in court. I'm absolutely terrified and don't know what to do. I lost my dad and I am also terminally ill myself. I'm doing nothing but cry It even stated on the letter value of goods stolen £0 :/ Please help!