Pain in throat

I am 10 weeks post hiatus hernia and fundaplacation it's been a hard slog only starting to eat solid food after six weeks. The solid food was limited with it sometimes getting stuck. I am slowly coming of nexium now taking 20 mg and after next week reducing to 20mg every other day for two weeks then stopping, but I am still getting a bit of heartburn. The problem that really makes me worry (and I'm wondering if anyone else has it) is sometimes if I've had to much to eat or drink I get a pain in the throat where the throat meets the neck at the front as if there's a lump or something. Then I have to burp but it doesn't go and sometimes I have to have some gaviscon to ease it! Does anyone know why this is.