Hi there. Sorry to hear about your struggle. I also suffer from migranes which started right around the time I was diagnosed with RSD. I never thought anything of them until I was getting one almost every day for 5 days in a row. When I started on gabapentin (neurontin) they went away. I find I have been getting them more often again but I can't tell if it is from neck tension or that I have more widespread RSD, quite potentially now in my neck, face and head. I am taking 800mg-1200mg a shot of advil (IBProphen) at the earliest sign of an onset. Once when I was at the hospital the doctor told me that if I was going to take anything for serious pain to take more than the standard on the box but not to overdo it through out the day. So I take what I said above and it usually keeps it at bay. If it doesn't go away I know it is likely to do back tension.
That's my spin on things. Good luck! TTL J