From the details given you seem to be suffering from acute situational anxiety a near phobic condition. What you need to undergo is systematic desenitization process. A clinical psychologist specilized in cognitive behavior therapy can help you out. If you want to try it by yourself get trained in sytematic relaxation models, then visualize the sitution (invivo) and bring down the resulting anxiety by using the realxation method. But getting the process done by a professional is always preferable