Ive read a lot about people dying after getting covid vaccines. i got my first dose 3 days ago & had a sore arm, headache, eye pain, diarrhea, & now i feel weak/light. what are the chances of me experiencing something serious like stroke or worse?

Different vaccines cause varying side effects and you do not mention your brand. There are "claims" of 20,000 deaths worldwide but not separated into vaccine categories. Extremely low chance in USA of stroke or myocarditis, but can occur. Usually bad or severe events occur in first few days, and before 2 weeks elapse. Thereafter, unlikely to have problem.

You could have "read a lot about" deaths from COVID vaccines only by searching online and finding reports that in fact are exceedingly rare. Getting COVID and dying from it is far more likely than dying from being vaccinated. Your sore arm is from the vaccine, but probably not the other symptoms. There is almost no chance of a dangerous reaction from your second dose. Good luck.