I have seen the picture attached. It seems like there is an obvious strain on your throat. The white streak is not serious. However, the throat, the tonsillar folds and the walls seem inflammed.
You will benefit by doing gargling with Betadine
solution that is available over the counter. You can also try simple warm water gargling with salt thrice daily too.
Give voice rest. Except for your commercials, try to limit your voice use.
If you do not get better in a couple of days or the areas of white streak increase in size, you will need to take a course of simple antibiotics. I do not think it is required now.
Stay away from too hot and too cold
Get well soon. Let me know if you have more concerns.