I'm sure that it can get better, allergies tend to be auto-immune and age relevant, since we know cat and dog hair exposure at below the age of 10 significantly reduces children's future risk for fur related allergies.
From my own experience, I've overcome minor nightshade allergies before through cold showers, runs and exposure through gardening work before and found that with enough consistent exposure, after the initial flare off, I definitely grew at least a short term resistance to it, enough to not respond again for another two to three whole years