Just a bad day or...?

Hi ladies, I’m feeling extremly bad today...I haven’t had much problems during pregnancy, just some nausea in first trimester and thats about it (I’m lucky, I know). I’m 33 weeks today and I got up today feeling kinda off...and it’s just been downhill ever since. I can’t stand up for more than a couple of minutes, my lower back hurts and the pain gets down my legs making them really weak. And now I started getting super dizzy, nauseaus...I’m lying on my left side, drinking a lot of water, took a nap but nothing seems to help. Do you think it’s just a bad day or something else? I’m a FTM so I’m not sure if thats something to be alarmed about...I do feel my baby boy kick as usual, a little pain in my belly but not contracting...