I have gas and stomach pain after every meal. I'm 75; this has been going on for 2 weeks.
There are many, many reasons people get gas and stomach pain after eating. Since this sounds like it's something new to you and has been persisting for a couple of weeks it's best to get checked out by your doctor. It could be anything from a side effect from a medication you're taking, to a new food sensitivity, to something more serious. Gas and stomach pain are 2 of the more typical symptoms of IBS - Irritable Bowel Syndrome. You may want to read my most recent Sharepost on the IBD home page.
Inflammatory Bowel Disease
Dairy products, legumes, raw veggies, pork, potatoes, pasta, etc. can all be foods that cause gas and bloating for many people. You may want to try not eating these types of foods and see how you feel.
You can read about Gas here in this overview that also includes belching.
But, I'd still call your doctor today to make an appointment, just to be sure it's nothing serious.
Best of luck,