There are only two medications that is proven to grow hair. These two medications are: (1) topical minoxidil (2) oral finasteride. If you stop using minoxidil then whatever hairs you gains from using minoxidil will be lost.
The most common cause of hair loss is genetic. Male pattern hair loss. You seem to have typical male pattern hair loss and hair tranplant can be a good option for you to regain your hair back. To slow down future hair loss you can start using minoxidil or propecia.
It seems you have seen many doctors and have a treatment regimen. There really isn't much more "out there" in terms of treatment. The best course of action is to find a good doctor and stick with the treatment and follow up with the doctor if the treatment does not work....
