Hello,
Thank you for your query at DoctorSpring.com
With a history of ulcers, it is quite possible that the ulcer got aggravated, may not be related to the physical acitivity but it does seem like it has gotten worse.
You need to rest and you can take Rabeprazole if you have ( potency is higher than Omeprazole ).
Also, the cause of the ulcer needs to be determined. If it is due to H.Pylori infection, then the infection has to be treated first. You can get an ultrasound whole abdomen and an endoscopy to find out the exact status of the ulcer.
Feel free to discuss further,
Regards.