Welcome in H.C.M.
I have gone through your query regarding white stone like thing with blood in phlegm for so many times in last 6 years.
By your medical history it appears as you having chronic tonsillitis
. These white stone like thing is the organise pus of tonsillar follicles.
The other development you just seen on your expectorated phlegm is due to infection which had it's place in sputum.
I would like to suggest you to consult your ENT doctor for examination and treatment.