What to do with multiple food allergies and my doctor 3 times did prick test of food allergies but the result is negative please answer thanks?

Different issue. Negative skin test results for food allergies is very reliable to say you do not have ige mediated food allergy. Allergy blood tests would not be needed as are less accurate than skin tests. Other non-allergic issues such as food intolerance should be considered. Either way, if the food you eat causes symptoms, then please avoid it.