Hi Erin,
You sound like me.. I had chemotherapy, radiation, hercepton, double mastectomy, all the rest. I think they really give you everything when you're young. I was diagnosed at 34.
After all of my treatments finished, I was scared of everything. Every time something didn't feel right I would think here we go again.. But so far so good. I am back to good health, I won't say that I'm back to my old self, because that girl is gone. However even though my oncologist says that most people don't want all the tests on a regular basis, I insist.
It really does help me feel calmer that if there was something going on I would know. So I go back and get the MRI, bone scans all that stuff. Even though it is
depressing to go back into that patient mindset, it's worth it for the reassurance that it brings.
You will naturally feel scared and paranoid, most people won't understand. But you need to insist on getting whatever you feel that you need for your own peace of mind. Especially that you have just finished chemotherapy you will feel the most vulnerable right now. Your mental strength will start to come back with your physical strength and it will get a bit easier.
I'm having all mine redone next week, even though I'm sure all is good...
Good luck with the herceptin I did it for a year and it was
fine, didn't notice any side effects. I hope it's the same for you. Xx