Hi delshay,
Sorry to chime in pretty late on this one, but just wanted to share my thoughts.
I have some knowledge of this kind of case, and the common responses from organisations. You really must both get an understanding of your organisation's policies in such matters, and get proper counil in terms of legal, vocational, and health issues.
If you are certain that you are well, and are confident of your interpretation of events, then you could see your regular GP (someone who knows you would be best), and explain the situation to him/her. Have the GP write a detailed letter explaining his/her professional opinion. Make sure the letter is written in front of you, read the letter, and be sure to understand it fully.
I would not recommend that you seek stress leave, unless you feel you need it. Perhaps you do need it, as you seem highly strung at this time. Perhaps stress leave is the most feasible way to cover your two days of being AWOL.
Having an official record of stress related illness can be used against you. You can research this yourself if you are interested, though I am not sure such research would be in your best interest at this time.
I am pretty sure you have not followed procedure up until this point, and this will never work in your favour.
I think you also need to make your point of view fully understood by your supervisors. I really don't mean to be rude, but I think you may have some difficulty communicating with people using English. Your expression is not always very clear.
Also, I agree with previous posters, that someone was probably having a joke at your expense. I guess people wt work would know you as a fairly tense, and conservative type of person. Is that the case? Please understand that I do not intend that comment in a derogatory way, at all.
Good luck. I hope it works out for the best, for all involved.
Oliver
-edit
P.S. On a lighter note, my work also has a very strict porn policy. Anyone can be fired for keeping it to oneself.