mama, there is nothing wrong with grilled cheese sandwiches and tomato soup... our family loves that type of meal.
As for getting irritated or short tempered, it does get so much better. The same thing happened to me... and I, too, had to walk away and give myself a "time out" to regroup. Now after 22 days sober I have SO much more patience and I am enjoying cooking and eating once again. I am actually doing some purging, organizing, cleaning, etc. You will get your energy and positive and happy mood back. You just need to hang in there one day at a time and you will get a huge reward... sobriety.
Keep us posted on your journey... I know it will be successful.