What Causes Nausea,stomach Flutters,back Pains,tiredness And Soreness In Breast?

I am a 28 year old female. Married with two kiddos. I can't stand for more than a minute with out nausea setting in (no vomiting). I have stomach flutters through out the day. Back pain comes and goes. We don't use protection,we do the old pull out method. I just had my monthly for July and it seemed norm. I am constantly tired. My areola is not changing and my breast are always sensitive (even while not pregnant). Goose bumps on the back of my thighs are also through out the day.