[Razo]

For the majority of my 17yo life, every few months to even a year apart, i've had ulcers appearing in my mouth, usually due to no comprehensible reason at all. They were usually just a minor weekend affair that would be little more than a slight inconvenience, but this year, the two times i've had mouth ulcers appear have been anything but a stroll in the park, Lasting almost two weeks, larger and so painful i had trouble talking properly and eating anything for a few days, and at around the same time around two other small ulcers would appear at around the same time.

I've seen the doctor and they haven't said it could be anything, but i'm a little more concerned, especially if it'll only worsen later in my life. No one else in my family has been affected by this so it puzzles me with what it could possibly be.
Another effect i've been noticing is the gums lining some teeth bleed whenever i brush, this could possibly be related. Unfortunately, i feel that part of me is to blame, as my dental hygiene throughout my life has been fairly average at best.

Basically, i just wanted to ask to see if anyone else has had this problem, or knows what may cause it? this may irrelevant, but through some blood tests over the past 2 years, including one last week, i've had an excess in iron, could this be at all related? sometimes my iron tests have come out normal and the last time i was told not to fast before the test, either way, what could this mean? also would anyone know what a good cure/treatment to the symptoms could be? deeply thankful in advance for any advice.

EDIT: one more thing, some people tell me to brush before meals, some after meals, and some both, which is it?