The MTX is better tolerated as injection, that is true for most. It is strange, that you have all these side effects five days later, that doesn't sound like side effects from MTX, to me. It could be a flare.
About the rash, the MTX should start working, before your wedding and will hopefully take care of it.
What is Aralen? Is it Plaquenil?
I am in love with MTX, it is the only thing, that helps me. It even stops my hairloss, which is huge right now. I get to restart MTX next tuesday. When I take it, I take it at night, right before bed, I do the shot, eat dinner and go to bed. The next day, I feel weak and slightly nauseated, but only slightly.
I may have been dealt a bad hand, but at least I'm still playing with a full deck. ( most of the time anyway).