Do you often see recipes that have ingredients in them that you can't eat and just roll right past them? Something you may look at and think looks delicious and you would have loved to eaten that "before". All you need to know are a few tricks, a go to list and toss out the fear.
First let me say that there is probably already an adaptation to the recipe you are interested in somewhere on the internet. There are also tons of resources on blogs dedicated to food without that ingredient you can't eat. No gluten, dairy, soy, eggs, grains, tree nuts, peanuts, seafood or meat. Plus you can find blogs on living Night Shade Free, on a Candida Diet and the list goes on. So when the first stumbling block comes, go online and research.
Next, know what ingredients you can have and what they swap out for. I'm sure those specific blogs will have lists for you. When you are just starting off find and make your list, post on the refrigerator or wherever you plan meals.
Now, play with your food. Take one of those recipes that looks so good but has ingredients that you can't have, and substitute it with an ingredient you can have. Give it a try. You will never know how that substitute will hold up unless you give it a try.
As you give these substitutes a try, make notes. Make a note on the recipe, on your list, anywhere that you need to so when you give it a try the next time you have learned more about the cooking properties of that ingredient.
Lastly, please have fun in the kitchen. Don't be scared it will taste awful. Sometimes it will but more often than not, you will have found a new way to make the foods you like and can eat. If it is so bad that you just can't eat it go to plan B, eat out. :-)