I have lived with parrots for six years. would i have already had hypersensitivity pneumonitis symptoms if i am susceptible to bird fancier's lung?

No: It can occur after years of exposure, in my experience.

Not necessarily: Some can develop symptoms after tolerating exposure for a time.

Workup, Mgt: An immune reaction to avian proteins is associated with HP, a lung disease which can result in shortness of breath, abnormal HRCT scans and dry cough. Management will include a follow up scan, pulmonary function testing, and O2 saturation test. If indicated your physician will prescribe steroids. If you have no symptoms, a screening PFT may be ordered. I would recommend a Bronch if your CT is +