You are entitled to a 2nd opinion. I had a screening apt locally in 2019, I was so anxious that they just told me I was anxious and did not fit the criteria to be put forward for an autism assessment. Other reasons were that I did not have developmental delays as a child, and my routine was not rigid enough (They knew this before I attended the screening apt). My GP obtained out of county funding through my local clinical commissioning group in early 2020, and I had an assessment at the Lorna Wing Centre in Chigwell, Essex on 25th January this year (delayed because of covid). I got my diagnosis at the age of 57. I wish you luck in getting a 2nd opinion.