Anyone have an idea??

The past few days I got these burst of energy. I was doing dishes making huge dinners and cleaning up right after everyone.
I'm 37 weeks and 5 days. I hit the nesting stage and I woke up this morning feeling uncomfortable. 
My head hurts more and I feel nauseous. I just don't feel 100% there.. I don't feel normal. I've been having major back pains for the past few days as well.. I usually have to stop what I'm doing and sit down to make the pain lessen a bit. 
Do you think this could be early signs of labor? 
If I'm anything like my mother the nesting stage meant I could go within the week.
I haven't been this active in 2 months and now I just don't feel right.. 
Anyone have an explanation??

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