Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain it seems that you are suffering recurring throat infection that seems most probably from Bacterial throat infection also known as Strep throat and the symptoms of roof of my mouth is a yellow colour,throat pain that is Pharyngitis along with red throat and veins appearing prominent seems to be due to it.. For confirmation consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigations like Throat swab culture can help in diagnosis.. You can be advised a course of antibiotics like Augmentin, anti inflammatory painkillers like Ibuprofen, doing warm saline gargles, steam inhalation and using a humidifier in your room can help.. You can also suck throat lozenges, chew Vitamin C pellet and avoid spicy and chilled foods.. Gargle with numbing mouthwash containing Lignocaine.. Hope this information helps.. Thanks and regards.