Excellent advice, ggreg. These situations have taken place a thousand times, and the physicians at the company are well aware that a year is the generally agreed upon time to be siezure free. It is the standard adopted by many DMV departments. I am not stating this is right. It is just the way things are. You may also be eligible for workman's compensation, even though this was an off-the-job injury. Some states cover this at a reduced rate.
I'd like to comment on the restricted work situation from your seizure health issue. You might consider talking with the boss about another position with the power company where you can do work at a desk, perhaps dispatching other linemen. You can get a ride to work via bus, taxi, relative, friend, or co-worker. Obviously you will need a signed physician note for your boss to take legitimate time off, make some copies, and if the boss ain't got no other position for you with the company, then make it clear you want to keep your job, so ask him for instructions on how to take medical leave (with or without pay depending on company policy). Also, on the amount of time off, if I were you, I wouldn't say six months; rather tell management the four months until you see the neurologist again, and go from there.
I was in a situation where I had perfect attendance, got on the board for excellent customer service, and yet when I had to take just a week off with doctor's orders because of fainting, they freaked out and gave me a really hard time about it. Employers have a business to run, they have a bottom line with finances, and keeping you is gonna cost them, so you are indeed between a rock and a hard place. The atmosphere with companies is totally different than it was years ago, when doing a good job was worth gold.
Let's just say you wind up with some sort of long-term epilepsy, the worst-case scenario, where you will never be a lineman again. While you are taking the required month off from work, get a nearby community college's catalog, study it, talk to a career counselor there, and sit in on a few classes of subjects that interest you. See, once you perhaps get the final diagnosis and recommendations about not working, you can still make a living, but maybe just not at risky jobs or where you have to drive whilst working.
What I'm saying in esence is, don't get caught flat-footed with all this; be prepared for the worst. And you OUGHT to be able to take medical leave, plenty of linemen get hurt on the job because of the nature of the work. You might can even find a website with a lineman support group who can help you through this rough patch and give you some tips on what to do.
Generally speaking, there should be at least a full year without seizure activity before you get behind a wheel. I would say there is zero chance of any physician clearing you to drive before that time. I could be wrong. There are some doctors who got their degrees with boxtops. A "second opinion" is meaningless. You got a raw deal, but the danger to others of you being behind a wheel is significant. The good news is, there is a good chance you will never again have a seizure. Usually they don't give anti-seizure meds until the third seizure. You should not be working as a lineman during that time because there are other types of seizures, called petit mal, where you lose a sense of awareness that could cause death around power lines. Essentially, you no longer have a valid driving license.