Do vets ever make you feel guilty even though you are giving your animal the best care you can?

this month i have paid hundreds for my cats and am giving them vet care from cheque to cheque. it just so happened that my new cat got pregnant as she ran away for a few days. i took her in for her respiratory problem, got that fixed, then her rabies shots and next am getting her spayed. i can hardly keep up with the vet bills and i feel they are pushing me to get additional examinations like blood work, chest xrays when i really dont see the need for them and it is extra money thrown in the mud for me... i feel like they are accusing me of not getting those done! no one is helping me out financially and i dont work that much at all. have you guys ever went through anything like this?