Hello, I have many questions and concerns. My child is 2.5 years old a...

Hello, I have many questions and concerns. My child is 2.5 years old and has been potty trained; we haven't had any issues with that for half a year, but in the last week, he started wetting himself. Additionally, he has started to squint his eyes (the ophthalmologist said not to do anything until he's 3 years old, so we've made an appointment with another doctor). There are no problems with phones or TVs; he barely uses gadgets. He doesn't want to go to kindergarten, although we've been going since he was 2 years old, but he just doesn't want to go. He speaks very well but doesn't want to talk about kindergarten. When I ask him how things are there, what he did, he just says he played and ate, that's all. Lately, he has become whiny, although he has always been a calm child. I don't understand what's happening; I suspect it might be psychological. My relationship with my husband is also tense; we try not to talk because any conversation turns into an argument, and we try not to interact in front of our child. I also understand that this might be part of the problem. I don't know what to do or where to turn; I'm simply exhausted from all these thoughts.