Itchy Eyes and a Healthy Diet

Liam had allergy testing last week to see if there are foods as well as other allergens that he should stay away from. I was not suprised to find that he is allergic to something, but I was surprised to find that it is eggs. I'm allergic to almost anything in nature (except, thankfully, food). I expected to find that he was allergic to dogs, cats, pollen, grass, trees, mold, or almost anything! But I was not prepared for eggs.
It is very frustrating to see my son when one of these reactions occur. He is so uncomfortable and I know exactly what he is feeling. It is also frustrating because I did everything in my power to make sure that he wouldn't have any allergies and especially not to food. I nursed exclusively for six months, only adding food to his diet when told they were no longer an issue and one at a time, I continued to nurse (w/o using formula) and am still currently nursing a few times a day. My son didn't have milk until after his first birthday (yet it still seems to irritate his eczema) and we never gave him eggs exclusively. This amazing considering that Easter was the weekend before the tests were done!
The only time that Liam has been exposed to egg at all, is through me and when mixed in a recipe like bread. Now we know that his reactions cohensided with eating those foods that contain egg in the recipe. Because Liam is allergic to eggs and seems to have issues with dairy, his diet is extremely limited. He is already very small and is only in the 8th precentile for weight. All of these things make me very worried about making sure that he has a well-rounded and healthy diet. We know that there are a variety of specialty foods at stores like Whole Foods and New Seasons, but our funds are going to be limited and we really need to find a sustainable way to get him all the nutrients that he needs without breaking the bank. Obviously, we will do whatever we need to do to make sure Liam has what he needs, even if this means no extra money and/or finding a little something extra during my summer breaks. But again, sustainability and a well-rounded, healthy diet are what we are looking for.
We have recently cut out all un-needed expenses: stopped putting money into our 401k, are in the process of canceling comcast cable, phone, and internet, and are trying to pay off a student loan that will free up a little bit of money on a monthly basis. We have also talked about putting in a garden to help with grocery bills and have cut our eating out and costly activities to a minimum. We are not "hurting" for money, in fact right now we are doing just fine. But I will be 1/2 time next year so things will already be a bit tight. I hope I don't sound like I am complaining! Because I am NOT! I'm so excited to be able to be home with my son more and it's a choice that we made as a family, but it will be an adjustment.
So if you have egg/dairy allergies and have any suggestions for us on how to make sure Liam has a healthy diet or know of some good deals, we would love to hear about them!