I must share the standard disclaimer that I am not a doctor and cannot give out medical advice. Crystals for healing should be used as a compliment to other therapies and not as a replacement for regular medical care.
With your healing issues I would recommend either, Smokey Quartz or Kunzite. They are both good at alleviating the symptoms of depression and anxiety.
As for the necklace you inquired about If you have worn it before or worn it for more then a week, then it will need to be cleared and recharged, just let it sit in the sun for an afternoon, the energy of the sun is very good at improving the feelings and emotions.
Master Crystal Healer
"Privacy Statement: To help others learn, we typically post questions like yours to our online database of articles about crystal healing. We only use first names and take care to remove all last names and email addresses. If you prefer that we not post your first name or if you would prefer if we not to post your question at all, please let us know and we will be happy to accommodate your request for privacy."