First off I want to Welcome you to our group. I am sorry that you have to deal with this awful TOS stuff. You will find a lot of educational information on this forum as well as all the support you need. It has taken most of the people here years to get a diagnosis for there TOS. So many Dr just are not educated in it. It sounds as though your Dr's are. Just to let you know to there is a sticky located in the top left corner of the main page with TOS Dr's that have been used and recommended by previous TOS pts.

I have been diagnosed with bilateral TOS by a very reputable neuro surgeon and then had it confirmed with a neurography. Have you had or looked into a neurography http://www.neurography.com
I also had a herniated disc at C5and C6 which was a failed fusion and correctly fused this last year.
I've had two TOS surgeries within one year. Both were on my right brachial plexus. I didn't have a rib resection; I had a scalenectomy and neuroplasty done I had a anti axillary approach as well as mid clavicular approach. I had nerve as well as some vein involvement. The reason for the second surgery was the septra film that was used to help prevent scar tissue didn't take around the ulnar nerve and I had large amounts of scar tissue building up causing sever compression on the ulnar nerve. He had to go back in and free up the nerve and redose the area with double amount of septrafilm. He also had to resect more off the middle scalene and remove adhesions from the top area of the middle scalene that weren't previously there. I am holding off on my left TOS side at this time because I need a break from surgery since I have had 3 in the last year.

I also have a history of sever migraine headaches just as you described. Initially nothing would help them. I in fact had gone to the ER one day prior to my TOS diagnosis for a sever migraine and droopy right eye in fear that I was having a stroke. They ran a CT with contrast and nothing showed up. Which was great. My General Practioner prescribed relpax and placed me back on topamax for migraines. The relpax was a godsend for me. After my first TOS surgery my headaches calmed down but it was about 8 month after the first surgery that they started to slowly return. Now that I have had the 2nd surgery and the adhesions removed from the scalene they seem to have slowed down considerably. I don't know if the adhesions are a part of the problem with the migraine but I have a good idea they were.

My surgery in general was not really difficult. My surgeon had great pain control and I had great pain control at home as well. Keep in mind that I didn't have a rib resection so I can't speak for that.
Although after this last surgery I am having some issues with a very irritated ulnar nerve in my right arm and I am now on a medrol dose pack to help reduce the inflamation. I was allowed to drive about 3 weeks to a month following surgery it depends on what your surgeon will allow you to do and your range of motion and comfort without damaging anything.
Keep in mind TOS can be helped with surgery but generally not cured. Everyone’s experience is different.

I hope that others will post there experiences for you here and give there opinions.
I wish you the best of luck and I'm sorry you had to join club TOS but
Many Hugs
Dawn