This can be a very sad thing, especially after having your dog for as long as you have. Most doctors and allergists will tell you that you should probably get rid of your dog, but pet lovers and owners everywhere will probably say otherwise. A dog is part of the family, much like a child is. So rather than get rid of it there are other things that you can do to help minimise your allergies.
The first thing to realise is that it is often not the fur that you are allergic to, but something called dander. This is like dandruff, but at microscopic levels. Washing your dog regularly with a good shampoo will help to minimise the dander around your home. Regularly cleaning is also a must, especially if you have carpets. Better yet, tear out the carpet in your home and replace it with hard flooring to prevent dander from sticking to the floor.
Make sure that you keep your dog off of the sofa and the bed. You should even take it one step further by trying to keep your bedroom dog-free. HEPA filters also work great, either in your main HVAC system or in a portable one (if you live in an apartment). Lastly, take some good allergy medications like Cetirizine and Fluticasone.