Severe cramps all over body. In person.

My mom is regularly suffering from severe cramps all over body such as hands, legs, abdomen and chest. The cramps just happens with even a single sneeze/cough or a simple stretch. She is not even been able to laugh out freely as this would usually end in cramps. Once the cramps was so severe that we admitted her in the hospital and ran her through all sorts of tests, but all the tests showed normal results. As far as her medical history is concerned, she has thyroid , BP and uterus removed 17 yes ago because of a cyst. If anybody could help me out to cure this thing and  help her relieve from this painful cramps it would be very helpful. If this cannot be taken via msg kindly suggest me a doctor who would help me with this by meeting then in person. Thank you.