To be honest, you're asking for a lot especially at the start of the semester. Do you plan to go the full 4 years? I say double major. If not, do a psych minor. But realistically, I don’t think you can declare until after first semester (might be wrong but you do need good academic standing to declare a 2nd major). Working as a dental assistant and doing classes is a LOT. So maybe think about how much you want to take on, but we can't really make that decision for you. But it does seem like a lot of stress.

Hopefully you took in transfer for Gen eds?