I have nausea, abdominal pain along with severe pains in the leg

I HAVE NAUSEA, ABDOMINAL PAIN ALONG WITH SEVERE PAINS IN THE LEG, AT MORNING VOMITING IN YELLOW COLOUR, DIZZINESS, AND SOMETIMES TACHYCARDIA....... THESE PROBLEM IS STILL CONTINUE SINCE LAST 3 YEARS.......... WHATS MY ACTUAL DIAGNOSIS, I M CONFUSED THAT WHY MY DOCTOR CANNOT CURE ME IN LAST 3 YEARS ..... HELP ME IN DIAGNOSIS