Sudden vomiting?

Hey people …

I just woke up 10 minutes ago and I felt sick. Then I had to throw up a little bit, the feeling went away and 2-3 minutes later it came back and I had to throw up a lot. Now it's gone again. I'm scared that it will come back because it's been a long time since I had to throw up and I was really scared. There can be lots of reasons.. It could be that I ate something bad, ate too much, I have an upset stomach (my mum had stomach ache and my brother had diarrhea but nobody else had anything and it was 1-2 days ago. I felt great then too). But it could also be because it's my period (no, I can't be pregnant because I'm not in a relationship and I'm 16). I've heard you can get sick during your period.

But my question is: What can I do about it? I'm staying at my grandma's tonight, and she doesn't have any pills for it. I can't make myself tea or a hot water bottle either!

I am grateful for every answer!

Lg