MM there are lots of options for a date night that don't revolve around food. A movie, a massage night, a long walk, fun things like go-carting, a trip to a museum or gallery.. Just being in each others company, just the two of you, where you can both put the stress aside for a little and connect.
The romance card sounds pretty good. One time when my bf was out of town I made a whole bunch of tiny loveing notes to him... things I love about him etc. some funny and some sweet. I went to his house before he came home and hid all the notes around his house, taped them to the inside of cupboard doors.. stuff like that. He found them all eventually, haha I think after he found a few he went on a search to find them all. And 5 years later the notes are all in the same place. And we still smile about it.
Stuff like that and your romance cards can be a really nice way to remind each other why you love each other so much. And I agree that spending time together without the stress is really important. I have been with my bf for 6 years and we still do tons of date nights, and it helps keep us connected very well.
I hope things settle down for you both and you can find that sweet spot together again, I am sure you will.