I have a strawberry look like tongue with sore throat(pharyngitis) but i only had low fever during night, what is this disease?what cause it?

See an ENT ASAP: While it could be minor vitamin B12 deficiency, it could also be a much more serious condition, you need to see a md or ENT asap.

See a physician: You are probably suffering from pharyngitis. You should consult a physician to get tested for strep throat .Sometimes it can be from infectious mono also called the kissing disease. Your physician can prescribe you antibiotics if it is diagnosed as strep or bacterial pharyngitis.