I would definitely encourage you to not be disappointed. As a lot of people on here who have gotten their anxiety down to manageable levels will tell you—keeping your stress down is definitely an ongoing, far-from-perfect process. I know for me, even though I'm not panicking over every little thing in my body any more, not monitoring myself anymore, I still have a lot of fearful thoughts about my health, it's just that I no longer give them a lot of credence. Just a couple of weeks ago, I was doing a pretty vigorous aerobics workout and the middle finger of my left hand started to hurt. My very first thought was OMG HEART ATTACK, but, as I continued to work out, I countered that irrational thought with logic. I'd just completed a move that required me to push the majority of my body weight with my hands—0534, I wonder why my hand would have hurt? That plus I'm a 32-year-old female with no family history of heart disease. The likelihood that the pain in my finger was cardiac-related was slim to none, so I pressed on and eventually it went away.
What I'm trying to say is that these types of health-anxious thoughts will probably always be a part of our lives. The difference is how we manage them when they pop up. You've been doing well; you have proven recovery strategies, so recognize this is a bit of a bump in the road, some turbulence if you will, and carry on. Keep doing what you know works—counter your thoughts and recognize that in a week, two weeks, you WON'T feel this way.
Don't be hard on yourself, this is normal. You've got this.