OMG I feel so weird today

first off I'll start with yesterday I just felt so drained. I was awake but just drained no energy at all. Today I woke up grumpy and just feel weird like not myself it's so hard to explain. I'm usually a giggly happy girl but today I just didn't care about anything I was quiet all day long I kept zoning out. I have alot of pressure around my waist I think I might be constipated. and my boob's have been very itchy the past couple of days. Has anyone else felt like this before?