I can understand the plight you must be going through.
''THIS'' happens in some people and nothing much to worry about. Gets settled by 3 -4 days.
If you continue to have this problem of bad cramps and sickness, it is wort to visit the Doctor and tell the whole story, your symptoms and worries.
It is sometimes the urinary tract infection one get, you will need to check you blood and urine also.
Do not do sex till you are alright.
Hope this helps you.
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