High anxiety, depression & Autism questions

G'day everyone, hope everyone is having a good day & keeping their heads up high. This is my first post so don't really know where to start. Was just wondering if anybody has any natural ways that has worked for them to relieve high anxiety/stress that makes me feel like I'm having a heart attack at times, when I shouldn't have anything to be anxious about? I recently talked to a brilliant psychologist who couldn't legally diagnose me, but thinks I most likely have autism, I looked up the top 20 symptoms in Adults & I showed every single one, but I feel most people would at times show all these symptoms too. So basically I was also wondering whether anybody else has been diagnosed as Autistic & what has helped & what has not. Sorry for rambling on & any advice would be appeciated. Hope everyone is having a good day. Cheers.