The key to eating in Ireland - for everyone - is PUBS. Always pick a pub over a restaurant, it doesn't matter if you drink or not. The food tends to be terrific. The exception is Dublin, which has many nice restaurants.

However pub grub can be pretty carby. It is the land of the potato after all.
You can always get salads. Most everyone will have fish - go for grilled if you can find it, instead of batter fried. Smoked salmon is on many menus - and you haven't had salmon until you've had wild Irish smoked salmon. You should also be able to get steaks and chops.
I'm jealous. Ireland is a dreamy country, the Irish are lovely and you are pretty much guaranteed a great time.