Ftm. Severe foot pain 33 weeks

I am a CMA at a very busy doctors office. I bought really nice shoes like 2 months ago. They have been great until about 2 weeks ago. My feet are killing me. I've came home crying the last 2 days. They are slip on shoes and I can't fit a insole in there. I am thinking I may need to go back to my old shoes. The pair I am wearing now are "nurse" shoes. I also tried compression stockings. Helped with swelling but not the pain. My left foot is the worst. :(