Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concern. As per your complain and presentation of symptoms the symptoms seems consistent with Viral throat infection leading to sore throat and cold, mouth ulcers also occur due to infection causing inflammation of mucous membranes of mouth causing Stomatitis and yellow tongue is commonly due to deposit of debris and dead cells over the tongue surface due to improper cleaning.. Nothing to worry as the condition will resolve soon, you can take antibiotics like Amoxicillin or Azithromycin for 5 days to prevent any secondary bacterial infection which is common along with viral. Take anti-inflammatory painkiller like Ibuprofen. Do warm saline gargles. Steam inhalations and using a humidifier in your room will relieve.. Avoid hot and spicy food to prevent further irritation.. For soreness and ulcers on tongue gargle with a numbing mouthwash containing Lignocaine. Take a multivitamin tablet for ten days. Clean the tongue with a tongue scraper gently o using a soft toothbrush but take care not to traumatize the ulcers. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.