I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
The neighbor has no legal right to place a gate on your property nor do they have the right to expand the width of the road that they are using to travel to and from their property.
The only potential right that they will have is one of an easement of necessity and that will not allow them to make changes to your property of any kind that is not specifically authorized by the court. Certainly no widening of the lane or gating of your property will be allowed by the court.
The attorney you will be seeing can benefit from a copy of your deed----to show whether there is any previous easement over your property, as well as photos of your property, the roadway and the gate.
As for the easement you claim over the neighbor's property, if there is no writing memorializing that easement, then you would have to show either a similar easement of necessity, or a prescriptive easement. Your lawyer will explain how to go about establishing the easement allowing you to access your other property.
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I wish you and yours the best in 2016,