When you were a baby and had heart trouble and seizures, did they occur after getting a vaccination? If not, most likely there is no connection between getting vaccinated and having heart trouble/seizures....especially since you haven't had any problems since. Surely you have had several DTaP/Td vaccinations since you were a baby and if you didn't experience any problems, you shouldn't have any problem getting a booster. A meningitis vaccination is also a good idea if you're going to college.
Don't take the chance. Check the interest for side effects. I think seizures is one of them, but check. If you get a puncture wound, get a tetanus shot.