Autistica have provided a hub of resources to support autistic people during the COVID-19 pandemic including a guide to coping with uncertainty and tips for maintaining good mental health.
The National Autistic Society have also produced a COVID-19 resource guide including tips for autistic people and families.  
If you feel that you need to connect with someone then please do take time to talk with friends and family.  If you prefer you can talk to one of these professional organisations: 
Samaritans: call 116 123 (UK) or email 
Mind:  call 0300 123 3393 or text 86463 or email
National Autistic Society:  call 0808 800 4104