Symptoms include: bloating and rock-hard stomach. what can i take for this?

Need evaluation: Most likely constipation. However at an age over age 40, further evaluation should be completed prior to initiating treatment for what might end up being just constipation. You should see a colon and rectal specialist or gastroentrologist. The workup would likely include an office visit, checking the stool for occult blood and colonoscopy. For transient constipation, Milk of Magnesia (magnesium hydroxide) can help.