Hello, El.  I'm sorry your mother is not feeling well.  Your question should really be asked of a doctor, as many things could be contributing to this.  I have a 95-year-old mother-in-law who gets dizzy at times and one of the causes was a shortage of Vitamin B-12, so now she gets monthly injections of it.  Another thing was that her heart was beating erratically and just a few months ago, she got a pacemaker and it's made a big difference - she seems stronger now than she did 10 years ago.  She still has times when she feels dizzy or weak, but she's 95!

Anyway, that's just what I know from my experience.  I know that Wellbutrin can lessen one's appetite, so that could be related, but again, a doctor is the best person to evaluate what's going on.  I wish you the best and hope your mother is soon doing better.