33 weeks and feeling unwell

Eden

I woke up at 2am with heartburn and feeling like I was going to be sick. I took a tums hoping I would soon go back to sleep because I felt exhausted. At 2:30am I started having Braxton hicks contractions. Around 5am they started slowing down and by 6am they were gone. I took a 30 minute nap but I still feel miserable. This is my 3rd pregnancy and I have never felt like this before! What should I do?