Appears to be an anxiety disorder or hypochondriasis. The more you go for investigations the more your fear will increase. It's a never ending loop and this cycle needs to be broken.
Next Steps
contact a psychiatrist for detailed evaluation and understanding of your condition. also will help in managing it more effectively
Health Tips
stop making Google diagnosis and getting yourself investigated at your own level. do not go for investigations until and unless specifically prescribed by the doctor.
you will save a lot of money and this will help to break this loop also