Not pregnant, so what's up with me?

I haven't had a period since mid June, I get stomach cramps, sore boobs, feel sick a lot along with other symptoms that would suggest I could be pregnant but I've done 4 hpts and after visiting the doctor yesterday for the 2nd time he told me from a medical point of view and going from my last period I can't be pregnant 😢 anyway he sent me for a blood test and have now got to wait until tomorrow for the results. Has anybody else ever had all the symptoms of a pregnancy and not been pregnant? If so what caused it?