Hello Redditors, this is my first post on Reddit so thanks in advance for taking the time to read this.
I'm writing to seek some tips on how I can be a support to my husband, who has been experiencing symptoms of generalized anxiety disorder in the last three months. For context, he is coping with an unexpected illness in his side of the family, is feeling overwhelmed by all the upkeep that may be required at our new home, and frequently speaks of uprooting his life to move back to his family home in the west coast (we currently live and work on the other side of the country, and have stable jobs/good social network here). He's had a few panic attacks and I can see that his anxiety is manifesting itself physically (difficulty breathing, tense, tearful, etc) and it really breaks my heart. It pains me to see him go through this. I try to listen to him, give him a hug when he needs it, cry with him when he's teary, try to point to possible solutions or ways to mitigate the stress. But still, I feel helpless, and sometimes useless when I think that my attempts to reassure or console him have been unsuccessful. 
So what I'm asking is: what's the best way for a spouse to show support? How should I respond/react when he is experiencing a peak wave of anxiety? What kind of verbal or non verbal expressions would be most helpful?
We are relatively new in our marriage (just over a year) and I have not witnessed close friends/loved ones with mental health challenges, so I find myself wanting to help, trying to help, but I'm not sure I've been useful. I'd be grateful for any sort of tips. Thank you!