Hi.
Thanks for your query and an elucidate history.
The cause of sudden abdominal pains, shaking and sweating can be due to the following reasons:
Since your pain is increasing on lying down, deep breathing and also sneezing, we have to concentrate on the lower lung, pleura and upper abdomen- The causes can be a pleurisy, lower
lung infection, infection just bellow the domes of diaphragm.
These mimic
heart attack and hence it is very important to rule out the heart problem.
Get EKG, Eco -cardiography,
stress test done if possible under the care of the Cardiologist.
Get a Ct scan of the chest and upper abdomen to see for the lungs or colon problems.
Severe colitis,
diverticulitis too cause the similar problem of sudden pain, sweating and shaking.
The additional blood, urine and stool tests and
Colonoscopy if the EKG is normal can tell us better diagnosis and a plan for further treatment .