It sounds to me like you are putting yourself through something that really hurts you emotionally and mentally because you feel like you should. Maybe you can tell them how you feel and can arrange to see and communicate with each other through Skype! Luckily my parents are supportive of my mental health but I've definitely had to keep some of my former best friends at a distance because I realized they were just not good for me. Your health comes first! Having to spend three days in bed after a visit just isn't good at all.