This breed is famous for their energy!
I would suggest, before you try any medication, that you start obedience class with her. This will give you both some confidance and will teach you how to handle her. For the time being, when she jumps on you, turn your back on her. Don't speak to her at all. She's trying to get a reaction from you and doesn't care if it's a good one or a bad one. Any reaction is attention and this is not what you want to do at this point.
Benadryl is not depressant enough to help in your situation. There ARE medications that can help but I really think that your problem is behavioral instead of medical.
Let me know if you still have questions.
