Late period

Hey, I'm currently 15 days late for my period. Been trying to conceive for over 3 years. 
I'm 35 yrs old. I've done a pregancy test Monday last week and negative. 
We were meant to start clomid soon but with no period this is impossible. 
Symptoms- bloated, headaches, no appitite, lower back ache at night, creamy discharge.
Is it normal to just miss a period like this randomly? I've been stressed this month, nearly losing my job and a family member dying of cancer. 
I'm type two diabetic, recently upped my insulin as sugar levels been out of control. 
I'm just totally confused.com 🙃