It`s not right to say that your asthma
does not bother you because your symptoms of chest tightness
and difficulty in breathing point towards asthma. You need to consult a chest physician for a thorough check up which should also include a spirometry
and you can be then prescribed the requisite medicine. You may not be tolerating alcohol which sometimes may happen in some asthmatics. Whiteness of finger nails can be because of many causes commonest being anaemia
, so you should get yourself checked for that also.