Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that earache along with 
radiating pain to side of neck and 
sore throat along with a history of 
ear infection seems to be due to ear infection that is either lingering since one month or has recurred..
As ear and throat are connected via Eustachian tube therefore ear infection might have communicated to throat leading to sore throat..
I would suggest you to consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigations like otoscopy can help in diagnosis and treatment can be done accordingly..
You can be advised another course of antibiotics, anti inflammatory painkiller, decongestant nasal drops and antibiotic and 
analgesic ear drops..
You should limit of excess water exposure to ears like swimming..
Do warm saline gargles and take steam and 
sauna throat lozenges for sore throat.. 
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.