Cellcept Side Effects vs Benlysta

Hello fellow sufferers!

My rheumatologist recently swapped me from Imuran to Cellcept and I was wondering if it's worth riding this out or if I should consider Benlysta (her next option for me).

Since starting Cellcept I have become extremely irritible and have been waking up all through the night. It's been 2 weeks so far (off Imuran for 4 weeks) and I'm wondering if this is something that went away for others?

I also feel like I'm having a flare and forgetting everything. It's not wonderful but if it might go away I'd stick it out.

Alternatively how is Benlysta for those of you who swapped?