I had no notice for my PIP assessment, so am expecting to get rejected. I'm worried. Any advice?

I was admitted to Hospital in June 2020 after having a mental Health Breakdown. I spent a few months in hospital and was discharged in September. I was diagnosed with General Anxiety Disorder and General Depression Disorder. I was advised to put in a PIP claim which I did in Oct 2020.I have changed medication several times since September due to reactions and am now on medication used for Bipolar. I informed the DWP every time something changed. I received no letter at all for the telephone assessment and then out of the blue I had a phone call from a Nurse who said she needed to go through my form. I answered her questions and the call took no more than 10 mins. I received a text from DWP saying they had received my assessment report. I am worried now as I had no notice for the Assessment so I am expecting to get rejected.