I haven't been feeling well for the last week or so. I got my period on time this month but it wasnt 'normal' for me, it was very light and didn't even soak a tampon or pad. It did last 5ish days on and off though. Last cycle I was a week late and extremely heavy and severe cramping, this time I wouldn't have even known I was on.

Since this, I've been feeling so tired, going to bed early and not wanting to get up. I've been getting up to the toilet about 4 times a night and have a weird tender feeling in my breasts. I took a pregnancy test about 5 days ago when I was still 'bleeding' which was negative. Yesterday I felt really emotional, and keep feeling dizzy. I have no energy. My skin is awful and I keep getting mouth ulcers pop up, I had 6 last week, now they are healing I've got another 2.

What do you think this could be?