Internal massage cannot be done by one self. Another person can do it properly. Professionals can do a better massage. There are 4 types of massage. Two of them can be done by self. One is abdominal prostate massage and the other is anal peripheral prostate massage. Google the above words and if it resonate with you, do it, or discard it. you have not mentioned whether you have done with your fingers your with some device.
Prostate massages are sometimes professionally done in a doctor of urology's office setting for certain conditions. Also, there was a female doctor that sold a CD describing the proper techniques for this. Depending upon the technique done in your case, things should get back to normal fairly soon. If not, after a week, you should get checked out with your doctor or urologist.