First, I don't know what websites say that STD transmission occurs in this setting. To my knowledge there has never been even a claim of STD transmission through clothing; if it can occur, it is too rare to measure or to worry about. They call them STDs because you have to have sex to transmit them--and with rare exceptions that means vaginal, anal, or oral penetration.
Second, your symptoms don't sound like those of any STD. Third, if you caught any bacterial STD, the drugs you have had would have cured it.
The direct answers to your questions are:
1) No.
2) No.
3) A little urine dripping after urinating is not a symptom of any STD.
4) No.
5) Most likely your continuing symptoms are just the physical manifestations of anxiety. Just forget about them and they'll probalby go away. Otherwise, I have no advice about how to make them go away. Of course see a health care provider (again) if they continue to bother you.
Good luck-- HHH, MD
In case u might ask what symptoms are.....
1.) Slight burning after urination
2.) Dripping off pee after urination.
3.) No Discharge