It is possible to have an obsession with touching your tummy if you feel distressed in any way by having to perform the action and it is not a pleasurable experience for you. And if you find that it interferes with your ability to relax or live your life in any way, then it is possible it has become an obsession.
You may want to talk to a therapist in order to get an evaluation. You don’t want to assume this is an obsession when it may not be. Talk to your doctor about a referral.
You can also learn more about obsessions to see if your behavior fits. Here is a link to help you:http://www.ocfoundation.org/O_C.aspx
To help yourself now, try distraction. When you have the urge to touch your tummy, get up and do something. Either take a walk, talk to a friend or find something to occupy your hands.
Also, try to think differently about your obsession. Say to yourself that this is a chemical imbalance that is causing you to feel this way so you are not at fault.
It can also help to find support. On line groups, friends and family are good places to turn when you are feeling the need to touch your tummy.
I hope this has helped you,