Overwhelming Boyfriend and Mental Illness

So I myself am on disability for being very mentally Ill and my boyfriend of 7 months is so emotionally overwhelming. I feel bad stating that but I do not know what to do. I want to be there for him but everyday he is questioning if I love him, if I think he’s a failure, if I’m leaving, what I’m doing, why I didn’t text him for an hour. It’s honestly exhausting. I comfort him all day every day this weekend was particularly bad. I told him this weekend I would prefer to have to myself because it’s Mother’s Day and on Friday I was sick and he had a job interview anyway. I spent the whole week over at his house last week cleaning, paying for dinner, and spending all day by myself waiting for him to get home from work. I tell him I love him all the time and we will figure everything out together but honestly this weekend has been a nightmare. So much so that I am sick again tonight with the stress of trying to keep him calm. Please help I don’t know what to do. I love him but I have been sick with stress all mothers day weekend. What do I do