Thanks for posting your query at DoctorSpring.com
I have gone through your question in detail and I can understand what you are going through.
First and foremost, you will never develop any serious physical illness, say cancer, if you dont express the emotion and keep them to yourself.
Secondly you are getting sick after expression of emotions cause your body has learnt it this way. You need to unlearn this and learn proper ways of expression of emotions through behaviour therapy and biofeedback therapy. These both will help you in getting back the control over the bodily processes and make you feel better. They may work after 6-8 weeks but will help you in long run.
Hope this helps
If you have any further query, do let me know.
Dr. Srikanth Reddy MD