Thank you for all the information.
There can be a few possibilities.
The vibration or buzzing sensation can be from an irritation of nerve.
However, the recent onset pain can be from an inflammation or infection.
Pain can cause erection problem.
Prostate pain can be referred here.
I would suggest to take an examination by doctor.
You can have an ultrasound examination of testis.
I hope this information helps.
If there’s anything else I can do, please let me know.
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