I have numerous allergy problems and chemical sensitivities and am actually on disability for it. You may have a mold allergy. If the shavings had become wet and developed mold that could explain why you didn't react before. ALso, the more exposure to you have to something, the more sensitive you can get. You develop a hair trigger. It may be that you have always been allergic but you went over the line.
I give myself shots twice a week. I didn't used to be able to be around hay at all and now I can tolerate it so long as it is not in a confined space. I still can't go anywhere near straw. For me I get asthma attacks so I m not just talking about itchey eyes and sneezing. Wood shavings and sawdust are a bit bothersome but not too much so I use them on the chickens.
If you can find out everything you are allergic to and start to eliminate at least some of them, you can reduce the "total load" on your system and you may find you can tolerate the wood shavings again. This may include food allergies of which you are not even aware. I would see an allergist and get some testing done.
I would recommend that you go on the website for the American Academy of Environmental Medicine and see if they have an allergist member near you. There are two different schools of thought on the allergy testing and shots. The more prevalent requires you to go the allergist for the shots but the other develops a more precise set of dosages for you so you can give the shots to yourself at home. Sounds yukky but, especially if it turns out you have a feather allergy, it could make the difference in whether you can keep the birds or not.
You may want to start wearing a mask when you go around the chickens and perhaps gloves when you handle them. You might also want to keep a separate set of clothes near the coop that you change out of before you go back in the house. Again, it may take a lot of the fun out of it for you but I have learned to live with it.
