I have a history of cold hands as well and think it was early TOS.

Are you doing anything to depress your first rib? Like seeing a hands on therapist (pt, chiro, osteo, massage) or doing it yourself?

Life is far from perfect, but learning to shove my first rib down was a breakthrough for me.

Also, if you're exercising, you have to ask if you are doing any exercises that might be flaring you up such as pushups, anterior shoulders, neck, etc.