Concentration/Health

For the past 3 months I went to the hospital and doctors a couple of times because I had some breathing and coughing problems (especially in the morning).
Doctors gave me a blood test and asked me to have a x-ray done which I did, but everything came back normal apart from a tiny dense part in lungs. The Dr. at the hospital said it wasnt a major concern just irregular for some one of my age.

My problems of breathing have been persistant for over 2 years and I had made visits to docotors before but they kept putting it down to colds.
So in the end I gave up.

Then from november it became really bad and for once was not controllable so thats when I decided enough was enough.

Anyway at the hospital they gave me an appointment to see them in 1 months time after checking my blood and x-ray. When I went again I had more tests done and they ruled out the options of TBS which was a relief.

My symptons were/are - Breathless, Coughing, Vommitting, Hardly could sleep, tiredness, moody and loss of appetite.

They gave me breath-o-meter to record my breathing, some antibiotics and an apointment to see them again in a month.

When I went again (3 weeks back) the Dr. told me that the chart shows that you do have some breathing problems and they have put it down to some sort of asmah. I had more tests done and they still put it down to Asmah.
Ive been given a pump which contains some tasteless powder, which I must take twice every morning and evening, which I have been doing so.
The Dr. told me only if my symptons worsen then to see a Dr. immediatly but if they stay the same then there would be no need.

So far in them 3 weeks, my vommiting has stopped completely.
The coughing is persistant everyday, especially mornings (every morning when I wake up).
The breathing problem has only occured 2-3 times in the last weeks and wasnt really bad.
I still have a loss of appetite, feel very tired and sleeping pattern is messed up.
I tend to sleep at 3-4am even though I feel tired around 12. Ive tried reading a book, drinking a hot drink and just closing my eyes while in bed around 12 but it didnt work.

What am I suppose to do, I have exams in 2 weeks and I can barely concentrate on my revision. Some days I will feel alive and things will go well but like today im just totaly not with it.