Your doctor should be able to recommend one. In fact terfenadine is turned into fexofenadine in the body, so people have been exposed to fexofenadine since terfenadine was introduced about 15 years ago. With so many antihistamines which mostly don't cause significant sleepiness, there is no good reason to take one which makes you sleepy unless you particularly want to be made sleepy. True, the older antihistamines are cheaper. But for most of the day it is important that you should have normal alertness.
Drowsiness is a cause of accidents and impaired performance in work and study.
Help in the nose or eyes, where they are applied, and only there. As sprays for the nose they are not as effective as steroid sprays , but some people prefer not to use a steroid, and your doctor may prefer to prescribe a drug which is not a steroid. If you think they may suit you, you could try them. The newer antihistamine eye drops are more important because steroid drops do cause serious side effects sometimes and doctors rightly do not like to use the admittedly effective steroid eye drops. The antihistamine eye drops are similar to the so-called 'antiallergic' eye drops in effectiveness.