Welcome to HCM
We understand your concrens.
I went through your problem descriptions. I suggest you not to worry unnecessaily when a doctor is checking you thoroughly. He will take care of you don't worry. Worrying usually increases the pain and other panic related symptoms mentally.
The stabbing pain
after ice cream could be due to the acidity reflux which is quite common for people undergoing stomch treatment. Wait for the doctor to come to a proper diagnosis. Believe him and tell him the doubts you may have. He will understand you.
Hope this answers your query. Available for further clarifications.