What Causes Burning Sensation And Pain In The Legs And Hands?

My daughter, age 38, has been having pains and aching in her hands, arms, legs and her big toe has been burning. The pains and aches come and go and in different places at different times. She has been under a lot of stress with her 3 young children and her father was in the hospital very sick during the past few weeks. She has been to her doctor who has her on medicine for frequent panic attacks (which she has had in the past) and said if it doesn t get better she will run glucose tests on her. She has been on the internet and has seen information that maybe she could have MS and she is really scared. I know this is hard to diagnose this way, but what is your best guess?