Constant phlegm during day, not at night

Issues with almost constant throat clearing during the day in the last month. Oddly there is no issue whatsoever at night. I have a hiatus hernia but that is not new. I cannot tell if phlegm is coming up or going down from sinuses, but nose seems clear. Breathing a bit wheezy at times. Antacids, anti-histamines, steroid inhaler not working. Some days better than others, but I cannot identify any reason for such a pattern. Any suggestions?