Random nausea contained by throat!?

I get unselective nausea in my throat. Sometimes im shakey. Sometimes my heart beat fast. Im on a lactose intolerance diet and try to stay away from grease. I did throw up once from it but i don't know if it be from anxiety over it or the geasy food i ate. Somtimes the nausea lasts for a long time. Sometimes its solely a few mintues. Its usually bad around mid-afternoon and hours of darkness. This usually happens everyday. I've have blood tests and see a doctor everything came rear legs fine. The doctors suspected GERD. This nausea usually happens by chance and really scares me! HELP! You could own a ulcer or a hyadel hernia it will engender you feel that track.
sounds like a sugar problem, a hypoglycemic drop. see if within is any connection near eating sweets or bread or potatoes past you have these spells. Try intake smaller portions more frequently. Mid afternoon before supper, and past due night after teatime is prime times for sugar level to drop.
Also, when it happen, see if sipping OJ or nibbling toast or crackers help.