When does the fear stop?

Time behind the wheel is what you need. Never let any other vehicle push you to go faster than you want to or do something you are not sure of. For example, if you are turning right from the right lane, you will need space beyond the lane you are turning into to make the turn. Wait until the space is available no matter what vehicles are waiting behind you. Also do things to give you peace of mind while you are driving such as having a TPMS system. Plan your trips so you know the roads you are taking do not have low tunnels, etc. And if the wind gets where you are not comfortable, stop and wait until the winds die down.