Ok - this may have an obvious answer but i want to check

Firstly i have only been to the toilet once in the last 5 days,today being the 1st. I have severe stomach cramps like someone is pulling a belt round my stomach

2nd - about 40 mins ago i got an awful shooting / gripping pain on the left side of my chest where your heart is and is happening now every few minutes which i have no idea what it is

3rd - checked BP as it has ben high for a week or so but just now it was 138/90!!

Does anyone have any idea if its a heart problem / IBS or something else - thanks