Knowing yr age would help us get a feel for yr situation.
The older you are, the more you need to be acquiring career skills that will be a lot more validating and sustaining than a dog. We need a pet as a comfort animal, but I tried 3 different dogs and found that along w work, a dog was just too much. I am a cat person. When you are stressed, you don’t have to do a lot for them. You will be nurturing people a lot in yr career, so maybe try that first.