Are you sure you have identified the real stress sources and it was not just the exam pressure that is getting to you?
Being under constant emotional blackmailing (the default status of a strong feeler, like an infj) can cause a LOT of stress and pressure on anyone who is not very well in touch with their feelings and emotions. Communication helps, but they will still think you are just avoiding them and turn up the dial to get even more validation back.
That source however, is very very tricky to resolve since the other person has to understand AND comprehend the issue. For a strong feeler to recognize, that the other person does not use feelings as the base line for communication is quite similar to trying to teach that you can start a fire by pouring water on some logs. It's difficult, but it can be achieved but requires effort from both parties.
a quick fix however, is to reduce contact and ask for a 'few days / week off' so that you can chilllax and compose yourself. (Current excuse, post exam-tension blow off by vegetating).