Many a times it's normal for us to go through these kind of emotions when we got to make some hard choices as our minds need to go through psychological adjustment process. In some individuals it's a bit harder than others due to their vulnerabilities & would cause some stress reaction like the ones you are going through. You need to start being mindful about these emotions & experiences by have a level of acceptance. Start some lifestyle modifications like yoga, exercise, sleep hygiene & activity scheduling etc. Of it is getting harder to cope or if it's impacting on your functioning, I suggest you consult for appropriate medical or psychological treatment.