I am at my wit's end. It would be difficult to speculate on what might be causing your hair loss. It's unusual to have it concentrated on one side. You mentioned seeking help from a variety of sources. A dermatologist would be a good resource for you if you haven't seen one yet.
Some dermatologists even specialize in hair loss.
There is a topical solution you may want to try called Minoxidil for Men. The results vary, it is expensive and must be applied on a regular basis. The most successful method of treating baldness is hair transplantation. The procedure you mentioned, hairline synthesis, is listed on a Web site but we cannot comment on its effectiveness or cost. You may want to get a dermatologist's opinion before proceeding.