38 weeks & feeling the stomach flu coming on. What should I do?

Last night I felt perfectly fine. I woke up at 6am feeling achy. I took acetaminophen and went back to sleep. When I woke up again I wasn't as achy as much but I felt nauseous. Now I'm feeling achy, nauseous and my right side really hurts. I had some lunch and my stomach hurt even more after that but I haven't been able to puke. It comes and goes. Sometimes I feel fine but I still feel achy and other times I feel like I'm going to puke but don't. The last time I got the stomach flu I was done for two weeks. I don't want this to be like that especially being so close to having a baby. I have an OB appointment tomorrow so I'll talk to my doctor about it then and she what she says if I'm still feeling this way. In the meantime, what do you guys recommend?