Hello Good evening,
Your symptoms i.e. haemoptysis suggest some disease related to respiratory system like it may be infection or any other chronic illness.
First of all you should not worry so much and go for basic investigations like CBC, ESR
and chest X-ray.
These will be very helpful for the diagnosis, but if no conclusion will seen then only we should go for a HRCT
Scan of Thorax and Bronchoscopy
In your case diagnosis is most important and further all management will depend on it.