Funny you mentioned about cold. Main reason I leave Washington DC in winter these days because of my symptoms. When cold air hits my face and head I get immediate headaches and stop me on track.
I lived in DC for so long and have friends, doctors and other support network I kinda reluctant to leave so far.
Bangkok is super hot and I dont really mind and symptoms sure are less but not gone ofcourse. But once I get back to USA I am moving to south where it is warm all year around. Since so far I was able to do international travel and had a flexible job. But now can't do it anymore and it is kinda getting tiring and expensive too.
About serc, yes it was disappointing for me too. Didn't do much for the symptoms. Today my symptoms gone up and so I wear ear plugs all day

I am almost tempted to drink tonight but I hold off.
Holding conversation I totally understand. I even sometimes felt dizzy in the past just looking at someone and talking. Not that bad nowadays but after a meeting no matter what I will be exhausted and come down with a headache especially if it is a small room with bright florescence light.
I tried so many things and don't remember I tried Turmeric. I eat spicy asian foods which sure has some of it and spicy food helps with my headaches too