I don't think im pregnant

one week ago i was feeling a lot of cramping. And i thought i was getting my period. And i was supposed getting Halloween and didn't show. With all the stressed i most been delay. First i noticed discharge in was clear sometime it become white. I figured it been changing in partners. But as week goes by my back started to aches and i feel more tired doing work. My breast got a little big. They are sore. I noticed i been eating a lot but it more of beef and pork. I never ate beef and pork this much. And i been going to McDonald's a lot. Never have gone McDonald's that much. I plan on going to my doctor tomorrow. To see what wrong. And i hate drinking water. But been drinking it crazy for two days now. If anyone had any problems like this please help.