My son has been suffering with a painful stomach ever since the 8 week rotavirus vaccine 4 weeks ago. Anyone else had a simular problem and does it eventually get better. It's like really bad gas but worse. U can almost hear it move inside of him and he spends most of his waking day just crying now. I tried to tell the doctor this at his 8 week check up which he ended up having a little late and she totally dismissed me and said she doubts its the vaccine even though he was absolutely fine before he had it. I find he is straining all the time also now.