Yes the walk in clinic will assist you. I have learnt that it is absolutely important to take ones self out of stressful situations, i.e. move out or get another room mate.
Yes, the walk-in-clinic would help you. Try to keep in mind that this is a temporary situation and to some extent it's us who decides how we will allow others to make us feel. Don't give all your power to this person. Do your best to avoid him, and tell yourself that you are going to have a good day in spite of him. Get out an exercise even if you just walk, this helps a lot with anxiety. I know it's going to be a long month, but at least there is a light at the end of the tunnel. I hope this helps and wish you all the best!