Help! What's this feeling?

Hi!

This is my first pregnancy and I'm currently 36+2. I had to go for a growth scan on Monday and they told me after it that she's average size for 36 weeks but I could expect early labour as it seems like she's wanting out. The midwife also told me to try some self induction methods so last night my partner and I had sex and I've been squatting, lunging and performing a kind of acupuncture on myself.

Today I have felt absolutely fine, better than usual actually until this evening. I suddenly felt very strange but I can't quite describe how it was that I felt. It was like everything was really heavy (my legs and hips in particular) a little bit of dizziness, I was struggling to breathe easy - or for some reason felt the need to breathe really deep and slow as if I was breathing through pain. There wasn't any pain but I was very uncomfortable. I also felt really sick, like if I tried to be sick I would be and then about half an hour later I vomited but it was just stomach acid. I now feel fine again.

Is this going to turn into labour? Should I contact my midwife? What's happening to me?!

Many thanks in advance!