Stress at this stage of your life is normal and understandable, but it does sound like it's hitting you harder than most. Have you had issues with anxiety before this? 
You might benefit a lot by looking for some anxiety coping mechanisms, but one Id recommend right off the bat is to decide on a default plan. It doesnt have to be the best plan for the future, it's just your failsafe, your fallback if you don't end up settling on something else. Once youve got that, whenever the anxiety starts to build up, hold that failsafe close and repeat to yourself that you do have a future, and that your decisions today are not the end of the world