Hi. I get pains in my chest and upper back occasionally. About 18 months ago they got so bad that I was sent for an x-ray. It came back clear. They flared up again recently, and I had another taken. Again clear. The doctor said it must be costochondritis. I also suffer with pretty regular hoarseness and sore throats, plus what's been diagnosed as allergy-induced asthma (without inhalers I have random coughing fits). About a month ago the doctor gave me some antibiotics for a sinus/tonsil complaint. I have no cough. This week I again began to wake with chest pains, which became back pains later in the day. When I expectorated this morning I had mostly white sputum, but then two were a dirty green. More worryingly, one had a pea-sized lump of dark red blood in it. Almost purple. Should I go back to the doctor? Could the previous x-rays have been wrong? Or might it be a problem with my aesophagus?

I am 37 and otherwise pretty fit, cycling for an hour a day and playing sport on the weekend. I don't smoke now, but did for about 15 years.