Thank you for your question.
Penis size cannot be increased by medication. As long as your erect penis is about 2 inches long it is sufficient for intercourse because it is only the outer 2 inches at the entrance to the vagina that has maximum sensitivity.
Regarding position of the testes, it is quite normal for one side to be higher or lower than the other. Please check if you have any symptoms of Pain, swelling, discharge from the urethra. If any of these exist you should seek professional help.
Hope this helps