You can always call your T. I mean, a T helps when thoughts overtake and affect daily living: that's their job! Why wait until you regain control on your own...when you could call and feel better, and cared for, immediately?
Self doubt is common, especially in college, imo. IDK what course work you have taken already or what you are into now, but certain courses can make you feel inferior. By the time you are to the point of helping others as a career, you will be ready. If you look at how on earth?! of a PhD when you're a freshman, there's no way you feel you can do that. But you learn along the way, building on each bit of knowledge.
Stress, whether implied or real, affects how we feel emotionally and physically. Make a decision and stick to it...that often helps relieve some of the stress. Ambivalence destroys us, imo.
What are you doing for that sore throat?