Out of my body

I feel like I’m outside my body or something. It started with overdoing it while swimming. I swam about 7 laps in 15 minutes and I was done. And I way overdid it. My muscles were all screaming in pain the whole way home, and I took three Advil when I got there and it took the edge off a little. But now I just feel really weird. Like my stomach is not right. Like I can smell vomit in my nostrils even though there is none around and my breath doesn’t smell like it. So I am physically crippled by the muscle pain – only 30 minutes till I can have more Advil! – and mentally crippled by completely having no idea what is going on. I haven’t done anything tonight. I’m alternately cold and hot. I don’t know if I’m sick or not. My brain is just non-functional for no apparent reason. I was fine earlier today. What the hell is going on? Who took away normal me and replaced her with some imaginary thing? And no, I have not had any substances. Except Advil, and probably some chlorine while swimming. I just feel so freaky. I’m not even in my body.