It sounds like you are intuitive to the energies around you.
For negative energies you should consider cleansing yourself and your home along with raising some protection. This can be done in many ways it really depends on your personal preference and your access to certain items like herbs and stones. White Sage is perfect for cleansing and is rather easy to find in shops and online.
I'd sugest researching types of cleansing and protection to find one that suits you.