Petechial Rash

Allahuakbar....
Today morning while getting ready to work, I realized that my whole upper chest was full with red spots.After a more thorough check up, noted a lot of petechial rash all over my face, trunk and upper limbs.What is happening???

I've been feeling feverish at night for the past one week and dry cough for a month...
My MO asked me to do chest X-ray and Mantoux test to rule out TB...
I did FBC stat which was painful (I almost made a drama, hahah), which came back perfectly normal, no such thing as ITP...perhaps just viral fever..
Some said its allergic...well, what is the allergen?
Dengue? No documented fever...no other symptoms...even though my housing area is a dengue prone area...

I've been thinking about the possible allegens...
I've been taking Erythromycin for a week, just one more dose left, so I just stop taking it.
I've not used any new facial wash or cream or soap or lotion...
The water in my house is not contaminated "clinically"...
Seafood? Why suddenly? After 20 plus years of life?
The only new food is the Nesvita drink which I drink every morning for four days as my energy source...so I shall stop taking it...

Perhaps some immunodeficiency thing...I should do biohazard test since I'm at risk from my profession...

Today I came home from the tiring tagging...I changed everything on my bed - bedsheet, pillow case etc
I stop using any facial products...
I washed my face only using water from the tap, not the one collected in the basin...
What else to do...?
What if tomorrow I wake up with worsening rashes...?

I'm documenting this down, in case anything happens to me, someone will know the chronology...

This is my first presentation, I've never had it before
It is not itchy, but it bothers me so much especially when it involves my face...

May He heal me sooner...