My sister was preparing for CA finals for this coming November. Now all of a sudden she is under a lot of stress and doesn't want to study and thinks about quitting CA. She is feeling anxious very frequently and feels heavy chest. But after some distraction that heavy cheat goes away. But every morning now it comes and becomes worse for sometime, until she is distracted. She says the negative thoughts keep coming. Please suggest the best way to deal this, or any doctor who can help.