I'm 50 and I have a suspected restrictive lung disease. However, it's now about 11 months since I started having tests to find out what is going on. You may need to be patient for a while yet In this type of thing they rule one thing out at a time it seems.
I actually got my x-ray results the day after having it done, but this was because it showed pulmonary oedema, which can be very serious and so needed treatment straight away. The radiologist phoned my GP, who in turn phoned me to tell me and to start me on treatment. If there's a major immediate concern they would phone you. However, there was no sign of restrictive disease on my x-ray at that point. It doesn't always show up on x-rays. Because of my x-ray findings I actually underwent cardiac tests before being referred to respiratory.
The next stage for me was cardiopulmonary function tests, which is what actually showed a restrictive pattern, and ruled out an obstructive disease like COPD. My function was abnormal both at rest and on exertion. These tests were followed by a CT scan, which showed some inflammation and scarring and strange black circles in the lungs, and a VQ scan, which led to me being referred to a thoracic surgeon for a surgical biopsy to try to get a definitive diagnosis. I am still waiting to hear about going into hospital for that. However, even that won't guarantee a diagnosis, according to my consultant.
What I'm using a lot of words to say is please try not to get too stressed out about it - you may go down several routes before finding out a cause for your problems!
My symptoms are chronic dry cough, which gets mucousy when I have one of the frequent infections - although more in the winter, and breathlessness - sometimes at rest and often on minimal exertion, as well as extreme fatigue (although not so bad as it was). I also very often have a pain in my back at the rib cage behind my right lung. I lost three and a half stones in weight in about four months due to lack of appetite. The weight loss has now stopped, so I will have to actually work at getting the rest of my excess off! lol
In the meantime the best thing you can do, as I'm sure you already know, is to stop smoking! It really is crucial. I speak as an ex-smoker, who stopped nine years ago, but am still having these problems.
Let us know how you get on!