How not to be ticklish at the doctors...?

Ok well the last time I went to the doctor's, my doctor (male) kept pressing into my belly and it tickled sooo bad! I could imagine the look on my face struggling to not laugh and my doctor saw this and immediately knew it was tickling me so he kept looking at me and kept smiling at me, and I had a rather large grin on my face as well, and he kept pressing. It went on for sooo long! Then at a different time, one of the nurses was looking at my belly because I had a rash and she touched my belly and when she did my belly spazed out and I had never seen anything like that in my whole life!It was like there was an alien inside of me and when that happen she asked if I was cold but I told her no and that it tickled. My sides are my most ticklish spot and I like being tickled but not while im at the doctors. How can I make it stop when im at the doctors?