I am online and happy to help you with your question today.
I can understand your concern that you could be harming yourself. Depending on what you placing in your urethra you very very well may be doing damage.
Just the continued placement of even smooth objects will, over time, cause changes in the lining of your urethra and cause damage.
Also, what does the gender reassignment staff think of this activity? Have you considered the possibility that your behavior may remove you from the surgery list?
We have been experiencing problems with the chat system for the last few days. Our engineers are working on it. However, I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)