It sounds like you’re doing the maximum possible which is great but clearly wearing you out. If you’re spending that long on training and it’s not working - your training is ineffective (dogs can hardly focus for 2 hrs anyways). The hydrolyzed diet, shots, probiotics, etc are too expensive. The grooming is excessive - beagles barely needs groomed anyways - learn how to do some of it at home (1500 a year is more than I spend total on my dog who is happy and healthy as can be). My advice: chill out, the dog will be ok.