My morning sickness is back?!!?!

Amy

Guys I am miserable! My morning sickness kicked in at about 8 weeks and I threw up every morning like clockwork until week 14. I’m now 16 weeks and the last two weeks I’ve had occasional nausea but no vomiting until yesterday when it came back! And again today :( both times, on my way to work, while driving (my worst nightmare!) why is this happening? Could it just be the heat?