My sex partner used an an electric toy on my penis set on max voltage 2 weeks ago . i felt pain immediately but it went on for 30sec. theres no visible damage but it has been sore since then especially erected. took azytromicine too in case of std. ?

Not STD: This sounds like symptoms from anxiety. No STD causes symptosm like this and I doubt anything is wrong. But see a doctor if symptoms continue or you remain concerned.

See below : Likely experienced some trauma and injury to the nerves, tissues, and/or structures of the penis. Difficult to know or test for precise nature and extent of any damage; or to predict the rate and extent of recovery; or whether there will be any residual adverse effect(s). If not too severe, can expect complete recovery over a 2-6 week time period. Hope this helps. Shocking experience.