Welcome to Neurotalk. I am so sorry to hear about your accident.
I wouldn't get your hopes up for the neurologist appointment; they're often not that helpful. But there are a lot of other specialists, and perhaps your neurologist can give you a referral--maybe to someone who specializes in migraines.
One thing you can do besides rest is to inform yourself about PCS as much as you can. This site is one of the best places to do that. You can check out the "helpful links" sticky at the top of the forum, as well as the "success stories" if you are feeling like this will never end.
There are a number of little things you can do to enhance the recovery process, such as eating a good diet and taking the right supplements. There are a number of threads here that discuss diet and supplements. Some basic tips are to avoid caffeine, alcohol, refined sugar, and all artificial additives. As much as possible, eat unprocessed foods--especially blueberries, colored vegetables (different colors indicate different antioxidants), eggs (the yolks have Choline), and nuts (especially walnuts, almonds pumpkin seeds, flax seeds, etc.). In general, be sure to get enough protein and omega 3 fatty acids.
See here:
http://neurotalk.psychcentral.com/thread165807.html
Some of the most important supplements are B12, B6, Folate, Magnesium, Vitamin C, Vitamin D3, Omega 3 fatty acids (available in fish oil, flax seed oil, etc.), acetyl l-carnitine, and branch-chain amino acids (BCAAs).
As much as possible, try to ration your audio and visual stimulation and take frequent breaks--especially since your headaches are so problematic. Avoid bright lights and loud noises, wear sunglasses, turn down your screen brightness (for PCs, hold down 'FN' in the bottom left and tap 'F6'), etc. You can also download a simple software program called f.lux that is very easy to install and takes the blue light out of your screen after sunset. You can easily adjust the settings so that it always takes out the blue light.
http://stereopsis.com/flux/
Most importantly, hang in there, be patient, and do not give up. The healing process may take months.