Thanks for writing to H.C.M. for your query.
I have gone through your query regarding cold, cough
. blood in sputum and fowl smell in sputum. Your all these features indicates that you are suffering from respiratory tract
infection which is involving nose and sinuses, pharynx, larynx
and lower tract.
Blood may be comming out from infected mucosa which becomes fragile due to infection, fowl smelling discharge may be fluid draining out from sinuses as post nasal drip
and smelling bad due to infection.
For treatment you should do-
(a) C.T.scan of paranasal sinuses
(b) Culture and sensitivity of throat swab.
A thorough examination and clinical co-relation of inferences of investigations one may reach to proper diagnosis that may be accordingly manage.