Potty training - I'm beyond stressed

I had a breakdown twice today. Potty training is just so hard. My 3 yr old did great then had 2 accidents today, poop and pee. He's already regressing. I've been cleaning up messes. I'm reminding him of the potty ALL DAY EVERYDAY for the past 3 weeks. I mostly tell him to go to the potty. He doesn't tell me often at all that he has to go. I don't wanna wait until there's yet another accident!!! The whole thing is beyond frustrating. And I have to hold in my anger and then just breakdown in tears when he's not around. I'm so entirely sick of people saying "ohhh my kid was trained in 2 days with no accidents at 2 yrs old!!" 🙄🙄🙄 I feel incredibly alone in all of this.