[jjtheblunt]

The only thing you feel is heated a bit in my experience (sports injuries, torso and sinuses).

However if they use contrast it might have lasting effects. I only had that once and swear it made me feel dopey for weeks.

[scythe]

If you had nanoparticle contrast (ferumoxytol) it very well could have stuck around for weeks. Gadolinium chelate contrast is supposed to wash out in a few days, though.