Foot drop is a bit of an oddity. It might not remit. I’ve read in the past that it often doesn’t remit whilst other symptoms do. So maybe you should try to get some help with it, quite apart from driving. Have a look at https://www.mstrust.org.uk/a-z/foot-drop
I’ve had it for about 7 years, but then I’m a long way past where you are with regard to MS.
If you find it doesn’t improve, see what you can do to help it out. If you don’t treat foot drop, it can have a bit impact on other parts of your musculature. For example, my right foot has the foot drop (it would be the foot that’s needed for driving wouldn’t it!). Because I didn’t have decent help with the foot drop for years, just kept on trying to walk, I caused my right hip a series of injuries so it hurts a lot of the time. People often do things like ‘hitch’ the hip up on the affected side which causes muscle damage, or swing the foot round, a different kind of damage.
Physiotherapy can help a bit, but to be honest, it never really helped me. If your foot drop is going to stick around, you can get orthotic help (things like foot braces to keep that foot in a stable position) or FES (functional electrical stimulation) which is the best long term solution.
So, give your foot time to resolve, try some physio exercises, but if everything else in your relapse gets better, but not the foot drop, then think about how to put it right for walking in the long term. That’s also going to be the time that you need to think about your driving.