It just does. Anxiety has given me heart palpitations, headaches where I felt like a band was squeezing me, seeing flashing lights, GERD, IBS, hip pain, joint pain, shakiness, muscle twitches, dizziness, nausea, belly pain and I could go on and on.
There is no way that a tumor would have been small enough for an MRI to miss. One of the characteristics of having HA is not trusting test results and constantly seeking reassurance. It's your brain tricking you…that's all.