Clinical examination plays a better role in your case, as you are saying you have done all reports and its normal..
In Allergic rhinitis all reports usually comes normal & it is a clinical diagnosis...
But for Asthma, your PFT can't be normal..
So it can be only allergic rhinitis or it can be Sinusitis also, where due to post nasal drip you can feel sore throat repeatedly. Or sometimes it can be nothing but a bit of Anxious nature & stressful life, which is making you to think over your minor problems again & again
Next Steps
consult a Pulmonologist Physically, for your queries & clinical examination