Bro that might be Health Anxiety you are experiencing..
I stopped smoking last 2009 and then syempre, I experienced withdrawal symptoms like nilagnat ako, dryness of the mouth, light headedness, dry cough for 2 weeks then after that i checked on the internet and voila! I have cancer (well, thats what my brain says). Kung ano yung nabasa kong mga symptoms sa WEBMD or whatever health websites that i visited, isa isa kong naramdaman and my Dad, who's a doctor is always laughing at me whenever i tell him na may masama akong nararamdaman, eh siyempre ako naman, wanting to know the truth, sabi ko i check up mo ko, which my dad agreed upon, so the results came back, im healthy, im clean, but im not satisfied, sabi ko sa Dad ko Daddy papacheck ulit ako sa ibang doctor(cause i am really really fucked up that time and i wanted a 2nd opinion). Then yun na nga, punta ko sa ibang doctor, had my blood chemistry done, went to get the results, and it is the same as to what my dad had when he checked on me. Then the Doctor asked me "Ano ba talaga ang nararamdaman mo? did you lose someone or something very important?" Sabi ko naman, Doc i stopped smoking, Cold Turkey, sabi niya "So that must be it, you are Anxious about your health, did you check the internet on symptoms that you are experiencing?" Sabi ko Oo Doc. So sabi niya, that's it, you are perfectly fine, normal lahat sayo. What you are experiencing is psychosomatic, its all in the mind. Then pinayuhan niya ko to do something na mapapagod ako like mag gym or maglaro ng maglaro ng kahit anong sports and niresetahan ako ng V's para pampakalma.
Kaya mo yan bro, pacheck up ka na, and balikan mo kami dito para sa resulta mo, you might be experiencing what i experienced too 4 years ago. God bless