HI there and Welcome to HealingWell!
You have posted in exactly the right place and nobody will call you names here... and if they do, me and Shy will get them! lol
More seriously, as far as I am aware (and I am open to correction here) but the difference between Effexor and Effexor XR is that XR is 'controlled release'. I.e. It gets released into the system slowly rather than all in one go with the Effexor. I have the same thing with my anti-epileptics. Instead of taking Tegretol, I take tegretol retard (An unfortunate name when you have to call it out in the pharmacy!).
Please do not be nervous. We all support and help each other here and the only thing we cannot supply is a replacement for good, sound medical advice. All we ask as moderators is that you post within the rules. (Which are pretty open)
All the best