Welcome to the forum! I don't generally have the feeling of a lump in the throat, but have in the past. I experience burning in the throat w/really bad flares, but usually it's more lower/upper abdominal discomfort w/occasional chest discomfort for me.
I'm glad you're going to see your GI soon, and hopefully, He/She will be able to get you on the right track. Other members here will also help w/insightful info.
Having Gerd is a lifestyle change;eating, sleeping, exercising, basically daily living. I suggest drinking plenty of water, daily walking if permitted, and avoiding all trigger foods. I have never noticed being tired w/GERD.
Good Luck and keep us updated!