Hoping for a little help ladies

I woke up feeling fine, ate breakfast as normal, stopped to get a coffee on the way to work. Took a sip... and that was the end of it.

I had to pull my car over to vomit... yuck.

I've vomitted again since I got to work and am now feeling weak and light-headed.

I drink plenty of water (2L a day at least) and have kept the fluid intake way up over the past few days as the heat rolled into Brisbane.

Could it be heat related? Or is my stomach just being squashed and there's no room left for food?

TIA x