May physical symptoms of anxiety / panic attacks change over time? this changes leading me to think about i have other diseases and boost my anxiety.

Yes they do : Usually the concommitant physical symptoms in a person with anxiety cahnge little over time and the person develops a pattern of predictability. However, sometimes they do change which leads to loss of that pattern and makes the person (like yourself) more anxious . The good news is that anxiety and panic are very treatable and the success rate is very promising. Get help and feels better.