It's not about feeling comfortable. You must tackle this whether you are comfortable or not. Some stuff in life is hard and you have to do stuff you don't want to - this is one such time. I'm not saying this to be hard on you - it's really important that you protect your own interests here, even when it's difficult. The University can't help you if they don't know about it.
Speak to a doctor, then take a note to your student support/mit circs team. Use your personal tutor/academic advisor to direct you to the right people if you don't know who they are. (A slight correction to the user above - the vast majority of PT/AAs are academic staff.)
Mit circs for stuff like this are granted all the time. Protect yourself and give yourself the best chance, and do it ASAP. Get a mate to go with you if you feel like you can't manage alone.