Buzing sound in head; head cold inside.

Hi all, Almost 10 years ago, my mother was prescribed to inhale a steam of medicine dissolved in water for some seasonal medical condition, but since then, her head gets chilled cold inside during winter and warm inside during summer, and there is always this buzz sound in her head during the winters. We consulted many doctors since then, got CT of her brain, but nothing is clear and the problem is still there. This winter she is severely suffering from the same. Even, sometimes her head is so chilled and sound is so continuous that she is unable to sleep. Thank you in advance for any suggestions/consultation { My personal perception is that the gas she inhaled, some how , got trapped in her brain ( seeing the pattern of cold/ warm of head). Again, I'm not someone from medical field, so can't say how is it possible or even is it possible! }