Something that the OP wrote really bugged me. He said that if he "dive to the bottom of my pool or drive up/down the mountains I am almost brought to tears." It's normal for people to get ear pain when diving down to the bottom of the pool. However, it bothers me the driving up/down a mountain is painful for him. I have known people with ear problem - but no one have ever told me that driving up and down a mountain is painful. It seems to indicate to me that the OP is much more sensitive to pressure change than most people. I would strongly recommend that the OP goes see a ENT specialist before diving.
Minh
Minh