Welcome in H.C.M.
I have gone through your query regarding blood in sputum along with feeling of some obstruction in throat, which gives you difficulty in speaking and some times in swallowing.
Your history favors for some local pathology in throat this may be confirmed by Direct Laryngoscopy
and if any lesion is there than that should be investigated further by taking biopsy
Here I would like to tell you don't think only for cancer because there are other possibilities also as - Tuberculosis
of larynx, Acute pharyngitis
Wishing for speedy recovery.