I think I might be doing the same myself. I too am unsure if it’s related to my just getting over being sick for two weeks and it’s simply lingering, or if it’s the Dairy? But I too have been dealing with congestion, sinus issues, etc. for the past few weeks and it’s getting on my nerves too. And I hate taking meds, but I do know allergies do affect me during this time of year, and of course, everything is frickin’ green due to the pollen right now.
Couple more rains should help with that though. 
I will definitely let you know if it clears up some, cutting it back out some. Probably just use it lightly, or not at all when I can. So unless it’s a big part of a meal, I will abstain when I can. 
I’m STILL hoping it’s not cheese (could be the change in the weather?) but trying to get a good sleep with sinus issues is nigh on impossible for me. Sigh.
I actually thought it was a different brand altogether. And after you posted it, I might check out that other one too. I did enjoy Creamer in my Coffee back before switching over, but the wife actually still likes HWC in hers, but only when she has one with a meal. If not, she drinks if Black, but prefers some creamer though.