I am sorry to hear that these symptoms have been so bothersome to you for so long and that they are still not under good control. It certainly does sound like what is going on is allergic rhinitis (nasal allergies) maybe with also allergic conjunctivitis (eye allergies). I suggest talking to your primary care doctor
to confirm this diagnosis.
For the treatment of allergic rhinitis, one very effective non-medication treatment for the symptoms is nasal washes. This is done with a slightly warm saline solution which flushes out mucus and leads to much improved congestion. Several commercially available systems for nasal irrigation are available over the counter in your local pharmacy.
Other than this, however, unfortunately there are no other effective non medication approaches, except for avoiding the allergens that cause the symptoms. So, for example, if you are allergic to dust mites, getting a mattress cover to protect yourself will help.
There are many effective, safe, and cheap medications that can help. These include antihistamines; although some of these have made you drowsy, it is likely that you can find one that does not if you simply try a few. Singular (montelukast) would be another nondrowsy option. Finally, nasal steroid sprays are extremely effective and safe. Talk to your primary care doctor about these options.