I don't really know much about how it works in your country. But in my country at university you would usually have a tutor who has responsibility for you or is your point of contact and so that would be the person to approach.

Also, you can be sure that there will be other students who have experienced these kinds of problems, and student services maybe able to offer help or advice.

FWIW my own advice, personally, would be to break down one of your homeworks into very small chunks, and then try doing just one very little chunk. When you manage it then it may help you calm down and give you a confidence boost, and help you to approach the next little chunk.

I hope you can find a good solution.