I'm not expert, but I'll tell you what I know. I think reflux can present itself differently with different people. The most obvious sign is "heartburn". But I know that acid in your throat can cause symptoms of coughing, asthma, nausea, hoarseness, bloating, pressure, etc. I know it gives me diarrhea too. I think your hiatal hernia can definitely add another dimension of funkiness to things!
Are you male or female? What is your age? The reason I ask that is that it seems like alot of women of perimenopause age (late 30's-60's), can experience "globus", which is a sensation of something caught in their throats. This seems to be more of a neuro-muscular thing.
Coffee and tea are very acidic. Some of us can tolerate some acid things more than others.
Sometimes, with my reflux, I only get nausea. Other times, I can actually have liquid spray up into my throat from some stomach, and it burns like heck. Sometimes I feel like my lower esophagus is spasming, and it sends a knife-like pain through to my back. So.....there are alot of different symptoms. Hope this helps.