I am a 26 year old male who has recently started a gluten free diet after putting up with years of awful symptoms similar to yours.
Once you start your gluten free diet, you must be vigilant in checking all sauces and snacks for gluten. Depending on where you live there will be many options for gluten free condiments, such as soy sauce, but it's better to check the ingredients before you consume anything. It is probably best to avoid eating out in the earlier phases of the diet, just to lessen the chances of cross contamination. You may want to avoid dairy in the meanwhile, but if you do suffer from celiacs/GI, you will most likely be able to tolerate them after a few months.
However, I still believe you can still have delicious and exciting food on a gluten free diet; just get use to preparing a cooking meals for you self. Meat, vegetables, fruits, and nuts and going to form the basis of your new diet and fresh herbs and spices will add flare and flavor to your cooking.
I suggest researching gluten free cooking a bit on the internet, as there is a plethora of websites offering recipes and lifestyle tips out there.
Don't worry about it too much. This is not the end of the world, but rather, the start of your new and healthy life.