My partner shows signs of undiagnosed ASD

Hi all, I’m very new to this whole thing. I have never even used a forum before, but I’m reaching out because I don’t know where to start and I’m overwhelmed by this news I’ve had. After conversations with my therapist, I feel that my husband shows many signs of being an adult with high functioning autism. 

What kind of resources should I turn to next to help me learn to cope with his social difficulties, repetitive behaviors, and anxiety? How could I find out if it’s worth it get on the long waiting list to have him tested? All I have read so far is the info in NHS about autism. 

Also does anyone have good book recommendations for understating adults with autism, or any person with high-functioning autism? 

If there is another thread about coping with autistic partners, please direct me. I need help. 

Thanks!!