I am very sorry to hear of what you are going through. I can relate to what you are saying, may be not that intensive but i can totally understand your anguish. I too have gone through university and felt disgusted at times when doing oral presentations. The thing i don't get is why communication is essential for computer engineering, you just have to be a good coder to become successful. You can have a successful career without having to speak much. It is even possible to avoid any oral communication at all if you choose to be a freelancer. I suggest you to not give up and keep going. It is very disheartening to me that your classmates and professors don't understand the problem you face, and being outright rude is simply inexcusable. I see that you have tried consulting psychiatrists and psychologist, but did you consult any specialist speech therapists?. Is orthophonist similar to the speech therapists?