Feel like I’m going crazy

So late last week and all weekend, I pretty much was in a bad mood and I don’t know why. Anything seemed to set me off and would leave me feeling angry or depressed. To top it off I kept having really bad cramps on and off throughout the weekend. I had my period from April 16 through the 19. It was barely a period though since I didn’t spot in my pad and when I would go to the bathroom most times it was spotting. Since it was so weird I took another pregnancy test a few days after it finished but it still came back negative. I’ve also been having a lot of acid reflux lately (I want to say these past three weeks). For me that is not normal. I know something is just off with me but I don’t know what it is. I shouldn’t feel this bad emotionally or physically. I know I have to go to the doctor. I’m just afraid they’ll say it’s all in my head