Surrounded by Misery

I am drowning in my feelings. Little insults feel like punches to my chest. I obsess over everything until I end up having a panic attack. I am being dragged down by my negative feelings. How do I just let this go? How do I have a carefree attitude about some things? Why do I over analysis everything? Plus, when I start to analysis things again and again, I start to blame myself even when it was never my fault.