A sore throat
can be caused by many things. Given that you are describing painful lymph nodes and a very painful throat, it is possible that strep throat is the cause of your symptoms. This can readily be verified or refuted with a simple visit to your primary care doctor
. Alternatively, an urgent care would be able to perform the required examination and possible test, although they would not know your medical history as well and would generally recommend following up with your primary care doctor in the future.
The sudden nature of your sore throat and its isolation to your throat and neck seem to make mono a less likely possibility, as this will generally present with a general feeling of being worn down and fatigued. Alternatively, and perhaps most likely, there are numerous viruses that can be the cause of a sore throat, and even things as simple as allergies and post nasal drip can cause a very painful and scratchy throat. Given your lymph nodes and your sudden onset, however, speaking to your primary care doctor about your symptoms would be the best choice to help you achieve a quick and full recovery.