Thanks for writing to H.C.M. for your query.
I have gone through your query regarding tonsillar enlargement and congested vessels in throat. As you told that your tonsils are not painful but enlarge, and little mucus you got in your throat.
Considering your complaints in all aspect it appears that you really have tonsilopharyngitis. To treat it you should take-
(a) Antibiotic - Preferably it should be decided according to culture & sensitivity of throat swab.
(c) Warm saline gargling.
As per your history of illness it does not appears to be dangerous but in future for prevention you should follow-
(1) Maintain your oral heygine.
(2) Avoid smoking
(3) Whenever feel any discomfort in throat please contact your family physician.