Glad you are enjoying the website. Sorry this reply is so late, but my computer crashed last week and I am just getting back in the loop with all my correspondence.
Migraines are OFTEN the result of food allergies and/or subluxations in the upper cervical spine. Do not hesitate to consult with a chiropractic physician in your area. Even better, call 800-614-4400 and ask for the name and phone number of a certified enzyme therapy doctor of chiropractic. That way you could also obtain some very effective nutritional recommendations and support for your allergies and sinus problems.
Congratulations on quitting smoking. It can take years for your body to clean out the residue of years of smoking. During that time you can experience more problems with your sinuses since they are a major detoxification pathway for you. Again, the above recommendation can help you learn what you need to do to clean out your system more thoroughly and effectively.
The increased sensitivity to barometric pressure is likely due to the increased congestion that you have noticed.
Feverfew is an excellent herb for headaches, and many people have reported it has helped relieve their migraine headache-type pain. It would be worth a try, but seriously consider the suggestion above so you can determine the CAUSE of your problem and work to correct that.
Also, last but not least, please check out the area on my website where I discuss food additives, artificial sweeteners, and MSG. Likewise, I always share the article on inflammatory foods with my patients who suffer from recurrent migraines. There almost always seems to be refief from avoiding as many of these things as possible.
Best of Health,