Is it normal to have this mucus /lump feeling in the throat with acid reflux
It's a very common symptom of acid reflux (so I guess you could say it's "normal" for people with acid reflux"). Typically the lump you feel is the red, inflamed areas your doctor saw during the exam, and the mucus is your body's way of trying to protect those red, inflamed areas.
There are things you can do to manage the reflux, but it takes weeks for those inflamed areas to heal so you have to be persistent. In addition to the meds you should avoid alcohol, caffeine, tomato-based foods and anything else that causes your reflux to flare up. You can also raise the head of your bed 4-6 inches and avoid eating 2-3 hours before you go to bed.