I guess that is the difference between an occasional dark / foggy ride and a regular commute. I got a set of 400L DiNotte lights (400 lumens front, 200 lumens back), and also have a "backup" generator light and a strong Blackburn blinkie in back. I also have an amber down-low glow tube to install when I am regularly riding in the dark at night (at high latitude, it stays light past 10 at the beginning of the summer here). I am also deciding what to install on the wheels to be more visible -- I am leaning towards tire stem lights, since they come in red / white for the back and front wheel, and won't throw off the wheel balance. I also just purchased a solar rechargeable amber light, which I am going to wear on my left wrist to make turn signals more visible. If I like the light, I will likely get two additional ones to wear as ankle straps -- this is what they are designed for, since clipless pedals do not have reflectors.

In any case, since I am set up for night commuting, I haven't had any issues or fear during the night or during storms (not much fog here!). Half of my commute is on a 4-lane road with almost no stops, where the traffic is light (so they can easily move over to give me the entire lane), but is moving at 45-50 mph in places (speed limit 40 mph). I haven't had any problems or fear with this setup. However, my light setup cost about the same as my bike... this is only going to make sense for a dedicated commuter.

Check your lights -- rechargeable batteries are better than regular batteries these days, so it makes sense to get re-chargeable AAs and AAAs and swap out for fully charged batteries regularly. And I am planning to get ski goggles to deal with cold/condensation in the winter here -- I'm sure you could get something similar for fog. Good for you, the next time out will be even better as you keep tweaking things.