My brother says I should get treated because once in a while I get rectal impaction? Is he right?

Should get seen. Constipation severe enough to cause impaction is not normal. It is worthwhile being evaluated. General advice for people with constipation: drink plenty of water, get aerobic exercise (eg walking at a brisk pace 20-30min/day), eat a high fiber diet and add fiber supplements if necessary. Avoid nuts, cheese, other foods that tend to constipate.