You could imagine yourself getting rid negative energy and gaining positive energy through grounding. Grounding is where you can gain extra energy from the universe to aid you and help you in your spell work. It also builds awareness and stability. Centering is when you center yourself and brings yourself together to unlock the power which is inside all of us. Grounding and Centering are two things that are able to help you when and after you get started with your magical workings. It is important that we learn them but that is your choice to do so or not.
It is possible that you released the negativity out of your body and your mind but it is still surrounding you because you did not banish it or you did not ground properly. It is causing you not to feel stable.
It could also be because of you not cleansing your chakras. Chakras are energy points. They can relate to our personality, how good our energy is, and much more. You chakras can leak, they can be blocked, they can be overactive, or they can be underactive. We are born with our chakras open. We just need to balance them. The more balanced our chakras are, the better energy we have. The better energy we have, the better our lifestyles will be. You can find methods on how to cleanse your chakras on YouTube, Google, and even articles on here.
It could also be the negativity from others in your environment. There could be other reasons but I believe more on the lines of what I stated above.