Can taking 2 much tylenol, 250 mg, 4/day for/3 days every day, along with some motrin, 400 mg, 3 days, plus every day taking tums at least 4 tablets/500mg, cause you to have a slight morning headache? & sometimes upset stomach?

Yes, it could. What other medications are you taking. It would be useful to discuss all the mediations, prescription, herbals, over the counter drugs with your doctor so that you are not over medicating yourself. Wish you good health!

You may have rebound pain. There are safe ways to take OTC analgesics. For example most nSAIDs should be taken with food or at least 8oz of liquid. More important, talk w your Physician about uncovering the cause of your pain and treat the cause rather than masking the symptoms.