Suggest Treatment For GERD, Lightheadedness, Cough And Shortness Of Breath

I have GERD. Lately have shortness of breath. Like bending over to tie sneakers etc. Also a few episodes of lightheaded. I have nasal drip so when I lay down I am coughing most of the night. I notice in the mornings am coughing up a yellowish-green fem I also have allergies. What do you suggest?