Hi there.
I don't have lupus (at least yet), but I do currently take enbrel and mtx (and plaquenil) for supposed RA. I can honestly tell you that mtx was the wonder drug for me. It was the last drug to be added to my cocktail, but it made all the difference in the world once I got to the therapeutic dose for me (15 mg/week). It did make a bit sick when I first started taking it, so I took it at night right before bed (and after a full dinner). It also made me sleepy for a few days afterward. After a month or so, however, the side effects for this drug went away completely. The full benefits did not kick in, however, until I took it for about 4 months.
Just make sure to take you folic acid too.
Best of luck,
El