Help!

I am 29 weeks pregnant with my first baby and so far I would say it’s been a pretty good pregnancy. I had a few day where my little guy (from what I assume) would put pressure on something in my upper stomach feels like lower chest and make it a little bit harder to breath but nothing bad. All day today I’ve had horrible mid to upper back pain (usually I have some lower back pain but not like this) and pretty bad pain in my lower chest/upper stomach but way worse than ever before. It starting getting really bad and then I threw up out of no where. Not long after that I got super hot and dizzy. I thought for sure I was going to pass out. I was texting my husband and about 10 min later it all stopped. I feel pretty normal now not even the back pain. Has anyone else experienced this? Is this just a new thing happening with him getting bigger? Should I go to the doctor or something? I am just so confused and don’t know what’s going on.