Gallbladder Surgery was in march,after April I felt like sudden cold waves sensation in body , firstly I was worried but  I thought its because of temporary nerve irritation , but it still continues sometimes.I also feel like waves flowing back of my ears or in neck area , these days Im also feeling rough skin and feel like to apply moisture .Today morning I woke up I felt like heavy in my head between temporal and parietal lobe (just like during cough and cold our nose feels heavy or just like something blocked and then opened) but it was episodic like repeated in 5 minutes, but not at a regular interval . what should I do? whats it? as I have overthinking issue,so is it due to any condition in body or just a matter of overthinking?whom should I visit? Next thing is that Im a medical student, small body symptoms make me think More and more and I always overthink about it.Because of this my whole day gets ruined and I am unable to do anything. Please reply ASAP