If you have GERD, be sure to always elevate your upper body when lying down. Do not eat 4 hours before bed.
The lump you feel is usually the result of swelling from the acid burning your throat. Get an upper GI so they can check for cancer, Barrett's and they can do a biopsy. Sometimes GERD can lead to Barrett's, which can lead to cancer.
Try throat coat tea and be sure to stick to avoiding the following:
Caffine (chocolate, coffee, etc)
Citrus (also apples)
Nicotine (non smoker)
Eating 4 hours before bed