this is driving me nuts

For two months my breast have been sore. I have bad heartburn which never happens unless im pregnant. So I took a pregnancy test and it was negative. so im like maybe its just something im eatomg thats causing heartburn. So I do a strict diet even make sure I dont eat just before bed time. but im still waking out of my sleep choking on acid. I'm waiting on my period. but i am still nervous because with my first born my. pregnancy test urine and blood were all negative up until i was 15 weeks. And I had what i thought was my cycle every month until i was 15 weeks. Nausea and heartburn is keeping me up. And my Breast feel horrible. Even if i get 8 hours of sleep im exhausted. So I started blaming the fact that I work Midnights now but that only eliminates me being tired. I am going nuts