Hey everybody. I'll try to keep this short but I need help in dealing with overthinking. 

I'm 24 years old and I've probably experienced this like 5 times in the last 4 years.

Usually when I realize that I could potentially be in serious trouble I start to assume the absolute worst. One thought turns into 100 and my body starts to panic. 

It feels like my heart is pounding louder than it usually does. I can barely fall asleep. When I wake up it feels like I haven't slept at all. My eyes don't feel tired. They don't have that grainy feeling that one's eyes should feel like after sleeping. After some time I keep convincing myself that everything will be ok but my body still continues to act up.

The longest its gone on for is about 3 weeks. I could be laying down in bed doing nothing and it still feels like my heart is pounding and I'm literally just watching tv or something.  I don't act like myself and essentially lose myself whenever this happens. 

There's really no pain other than having a headache. It's like as if there's pressure all around my head, like a balloon getting filled up or something. 

I've been able to overcome this before by either confronting the source or by practicing other techniques, or just by accepting things for what they are. But whenever I am in this situation, it feels almost as if there is no hope. 

If there is anything I should do to beat this I'd love your guys' opinions. I tell myself every time this happens that I'll be back to normal but it's hard to picture everything being the way that it was.

Thank you.