RAF medical

hello, I've asked a friend who is in the RAF this and he said I should be okay but I'm still worried. When I was around 13/14 I took an overdose due to bullying, I was then referred to counselling and within 6 months they were happy with my progress and I haven't had an issue with self harming of any type since. On the medically it's states 'more than one event of self harming of any type' since I've only done it once I thought it might be okay. I am now 18 and I'm due to do a medical and I was wondering whether I could still pass my medical or whether they'll automatically disqualify me? If I tell them how much I've progressed since or get a letter from my gp to say there hasn't been any more incidents would that help my case?

Thank you