terrible pain when bending over or lifting leg,acid reflux,questions

[sunnymom2]

I am 39 yo female. I have been dealing with a reflux diagnosis for 2 years now. In beginning I was on nexium which did get me better enough, my throat became better and most burning gone. I follow a very strict diet of no trigger foods and after nexium for 6 months I weaned myself off and seem to have it under control through diet. I do still take a few tums a day on some days when the burning feeling comes back. At the time 2 years ago I had the scope down throat as well as upper endo (no ulcer was seen). That is when they said it was reflux. However over last 6 months I have a new symptom and not sure if related. It is a terrible pain in my upper abdomen, it ONLY occurs if I bend to pick something up off floor, or if I lift my leg high up, like I was climbing over a short fence other day and it happened. When it happens it feels like a huge contraction across upper abdomen,right at diaphram and I feel something big move or slide across. The pain is like paralyzing. I have to just stay put and do short breaths, it goes away in as little as 10 seconds or as long as a minute. I also was noticing when I lie down on back flat I often now feel a lump or something move across my tummy, and it makes a lot more gurgling sounds than it used to. I am not overweight, on thin side, very active exercise daily, so I know it is not related to being out of shape in terms of the bending or lifting leg. I am getting concerned I actually have a hernia. Does anyone know if what I describe is a symptom,along w/ the acid burning, which does come back if I eat anything off my do not eat list, or when I took a multivitamin other day, I suffered all day w/ burnng, maybe from the iron? I am wondering if all along a hernia is causing all this? Would the endo 2 yrs ago have seen? I have also had 3 c-sections, dont know if that contributes to any of this. Thanks.