Yes few of these drugs may help in momentary immediate relief,
My suggestions:
1.Monteleukast may be used once at night for 2-4 weeks
2.use pillow to elevate head while sleeping
3.its pollen season, so keep windows closed as much as possible
4.wash ur curtains/lenin, and vaccum ur floors and carpets
5.use a humidifier if possible, this issue increases if dryness is more.
Child should be fine once the season changes, nothing much to worry
Health Tips
Consult for more detailed discussion :)