What Causes Sporadic Chest Pain Along With Nausea And Abdominal Bloating?

Had all different kinds of tests. Have pain off and on in between chest, been nausea for a long time Have to take antacids every day 2 x day throw up when it flares up Have lots of bloating and belching and gas. Lot of gas and belching. When I have an attack ( usually have low blood pressure) but it goes up then lost a lot of weight Everytime I start putting on weight I get sick again and lose it again My muscle mass was depleted I don t have much left When I get sick my body doesn t have enough energy stored and it takes what muscle I have left Leaving me depleted until I eat something. It s really weird. They have done several ultra sounds on heart and one on gallbladder have had upper and lower G I Drawed labs for thyroid , fsh, among other things. , had ekg s, hida scan , mama gram , Pap smear All tests turned up normal. Only some fluid on heart was all that was found. I stay weak a lot I need to know which way to turn next I m stumped