losty love the crutches! I got myself a pair of orange and black ones. We are Style Itself 
ins ah I see. Well, I would be asking for an MRI asap. I would be concerned about the pain that goes into the foot, as that is sciatic pain, which is common if a nerve is trapped. Nerve pain can also happen due to inflammation/irritation if the area around it is sore and full of inflammation, or is swollen and pressing against it, but it can also be due to it being trapped by something, such as a disc, or bone, for example. I would be concerned because this has come about very quickly after an accident and I would be asking for urgent referral to check that everything is as it should be with your spine. i.e., insist that your doctor/GP reviews your situation as if you have had a spinal injury.
I wonder, if you were to call OOH and tell them you had severe leg pain, and this follows an accident where you may have sustained an injury, whether they would send you to A&E?
It's difficult, but, really, given the accident, I would would;t be comfortable with this being fobbed off as something that can be left for a longer time, like it would be if these symptoms occurred with no obvious cause (not that being left in those circumstances is ok either, actually, but is less likely to be something like a fractured vertebrae). I am not for a moment suggesting you have damaged your spine in this way, but, that the only way you will know is proper examinations.
So, you need to be asking for MRI. Now. As an urgent case.
Also, do you know the signs for Caudia Equina? I mention it as you have leg pain. I will get the link from NHS direct, it's rare, but a medical emergency. We post it regularly to those who have leg pain. If in doubt, take yourself to A&E.
In the meantime - regular painkillers, don't forget paracetamol, it's an amazingly effective med, but needs to be used regularly, so 4 times a day, every day. And as losty said, protect your stomach with any NSAID medication. NSAIDS also work well with paracetamol, as do opiates. So, paracetamol + NSAID + Opiate (codeine) + stomach protector. Hot water bottles, rest/potter/rest, don't lift much. And, until you get a proper diagnosis, I would be very careful about what you do in terms of exercise.