I had serious indigestion issue. On June 1st, 2020, I left smoking all of sudden. I use to smoke around 4-5 cigarette a day. I had been smoking since last10 yrs. I started decreasing the number of stock on 2018 and after 2 years of struggle I quit smoking all of sudden. First 3 months I used to have a little headache and upset stomach. After that I started having a little breathing problem. If I workout, say running and cardio, I feel good. If I skip a day doing workout, I feel shortness of breath, congestion in throat. It's been a month I feel the same and little weakness. Is it normal? Or I might have something else. I don't have any other issue yet.