Am i having an anxiety attack?

I never had an anxiety attack before. But out of nowhere i started feeling a huge amount of discomfort and fear of seeing something i didnt want to see on my phone. And afterwards i thought the anxious feeling would go away like it always does but then i started feeling weak all over my body, i was slightly trembling and i had a shortness in breath. I tried laying down and everytime i inhaled i couldnt take a deep breath, it would just stop midway from forcing myself to do so. Then when i exhaled id start to tremble and it kept doing that for 5 minutes. I also felt a tiny bit nausous but not to the point where is was discomforting i just felt my throat tightening. Now i can finally take a deep breath in. This was kind of alarming to me.