How do I reassure my boyfriend that i'm ok, so he'll start helping himself again?

Earlier today I had a dizzy spell when no one was home and passed out. I have been having dizzy spells for about a year now. I saw a doctor and had some tests run but they don’t know why. So today I passed out on my bedroom floor. Woke up some time later and couldn’t remember much. I text my boyfriend and told him. After I had cleared my head, he asked if I was ok and everything, I said I was fine.
But now he keeps asking how I feel and if i’m ok. I know hes just concerned about me, but every time I tell him i’m ok he still asks. I really like him and he likes me so naturally I want to help him anyway I can. You see he cuts himself and takes antidepressants. He told me he wanted to stop because it makes me sad to see him so venerable He cut himself this past Thursday, but is getting professional help. Sense I passed out today he has been worrying about me instead of focusing on his own problems. What can I do to reassure him that i’m ok, so he can get the help he needs? Thanks.