Stove gas flames inhaling. Check myself.

Hi I have been inhaling stove gas flames daily thrice for 45 days not directly but I kept bowl which was small flames were coming from sides added water karvol plus and was inhaling the vapors the gas flames were on and high and I was inhaling with the help of towel over head close to bowl very deeply I used to feel headache but still I was doing as I didn't think it would cause any harm .now iam worried if I have been inhaling harmful gases like carbon monoxide etc because since then iam not keeping well always nausea fatigue mild headaches body aches upper back pain chest pain.in net I saw that those gases will damage the brain and will lead to death also .I have been doing for almost 45 days continuously thrice daily it been 4 months I have stopped but still I have itchy throat mild headaches fatigue nausea upper back and chest pain and shortness of breath .what can I do to check myself .I have done cbp,crp,lft,lipid,nt pro bnp,thyroid all are normal .