Find a force free trainer. One that uses positive reinforcement, food, toys and praise. Someone who can support you and be there for you during these difficult times. To help you deal with the problems with your puppy.
The dog training industry is unregulated. Do your research ensure that they don’t mention about being the pack leader or use correction techniques to train. This will undoubtedly make the problems worse.
You don’t have to struggle alone. Don’t feel bad for having moments where you are crying and feel like you need time away from the puppy.
Put your puppy in its safe space and leave it with a safe chew and go and have a bubble bath!